Coast, Ernestina and
Freeman, Emily
(2016)
Reproductive and sexual behaviour and health
In:
Champion, Tony and
Falkingham, Jane, (eds.)
Population Change in the United Kingdom. Rowman & Littlefield, London, UK, 167-192. ISBN 9781783485918
Cetorelli, V. and
Wilson, B. and
Batyra, E. and
Coast, E.
(2016)
Female genital mutilation/cutting in Mali and Mauritania.
In: BSPS Annual Conference , 12-14 Sep 2016, Winchester, UK
Coast, Ernestina and
Freeman, Emily and
Leone, Tiziana
(2016)
Medication abortion in Zambia: trajectories, costs and healthcare provider perspectives.
In: Medication Abortion: Availability and use, and impact on abortion safety and women’s health, 6-8 July 2016, Dakar, Senegal
Marczak, Joanna and
Sigle-Rushton, Wendy and
Coast, Ernestina
(2016)
Cross-national comparisons: a missing link in the relationship between policies and fertility? A comparative study of fertility decision making of Polish nationals in Poland and UK.
In: European Population Conference, 31 August - 03 September 2016, Mainz, Germany
Iemmi, Valentina and
Bantjes, Jason and
Coast, Ernestina and
Channer, Kerrie and
Leone, Tiziana and
McDaid, David and
Palfreyman, Alexis and
Stephens, Bevan and
Lund, Crick
(2016)
Suicide and poverty in low-income and middle-income countries: a systematic review
The Lancet Psychiatry, 3 (8). 774-783. ISSN 22150366
Coast, Ernestina and
Fanghanel, Alex and
Lelièvre, Eva and
Randall, Sara
(2016)
Counting the population or describing society? A comparison of English & Welsh and French censuses
European Journal of Population, 32 (2). 165-188. ISSN 0168-6577
Coast, Ernestina and
Jones, E. and
Lattof, S.
(2016)
Effectiveness of interventions to provide culturally-appropriate maternity care in increasing uptake of skilled maternity care: a systematic review
Health Policy and Planning. ISSN 0268-1080
Randall, Sara and
Coast, Ernestina
(2016)
The quality of demographic data on older Africans
Demographic Research, 34. 143-174. ISSN 1435-9871
Leone, Tiziana and
Coast, Ernestina and
Parmar, Divya and
Vwalika, Bellington
(2016)
The individual level cost of pregnancy termination in Zambia: a comparison of safe and unsafe abortion
Health Policy and Planning. ISSN 0268-1080
Coast, Ernestina and
Murray, Susan
(2016)
"These things are dangerous": understanding induced abortion trajectories in urban Zambia
Social Science & Medicine, 153. 201-209. ISSN 0277-9536
Ghandour, Rula and
Bates, Katie and
Imseeh, Sawsan and
Mitwalli, Suzan and
Nasr, Shiraz and
Hammoudeh, Doaa and
Coast, Ernestina and
Leone, Tiziana and
Giacaman, Rita
(2015)
National health surveys: whose priorities?: a case study of the Palestinian Family Health Survey (PFHS) 2010.
In: Lancet Palestinian Health Alliance 6th conference , 20-21 Mar 2015, Beirut, Lebanon
Randall, Sara and
Coast, Ernestina
(2015)
Poverty in African households: the limits of survey and census representations
In:
Jerven, Morten and
Johnston, Deborah, (eds.)
Statistical Tragedy in Africa? Evaluating the Database for African Economic Development. Routledge, Abingdon, UK. ISBN 9781138945821
Bantjes, Jason and
Iemmi, Valentina and
Coast, Ernestina and
McDaid, David and
Leone, Tiziana and
Palfreyman, Alexis and
Channer, Kerrie and
Lund, Crick
(2015)
Relationship between suicidal behaviours and poverty in low and middle income countries: systematic review.
In: 28th World Congress for the International Association for Suicide Prevention, 16-29 Jun 2015, Montreal, Canada
Bates, Katie and
Leone, Tiziana and
Coast, Ernestina and
Ghandour, Rula and
Imseeh, Sawsan and
Mitwalli, Suzan and
Nasr, Shiraz and
Cetorelli, Valeria and
Giacaman, Rita
(2015)
Inequalities in self-reported health (SRH) and self-reported illness (SRI) among women aged 15-54 in the occupied Palestinian territories.
In: Lancet Palestinian Health Alliance 6th conference , 20-21 Mar 2015, Beirut, Lebanon
Coast, Ernestina and
Freeman, Emily
(2015)
Lack of awareness of Zambia’s abortion law leads to unsafe practices
Africa at LSE Blog (5 Oct 2015) Blog entry
Coast, Ernestina and
Freeman, Emily
(2015)
Abortion in Zambia.
In: LSE Research Festival 2015, 21 May 2015, London School of Economics and Political Science, London, UK
Coast, Ernestina and
Jones, Eleri and
Lattof, Samantha R. and
Portela, Anayda
(2015)
Integrating culture into maternity care programmes: a systematic mapping of interventions
Maternal Health Task Force (4 Feb 2015) Blog entry
Coast, Ernestina and
Hukin, Eleanor and
Kamal, N.
(2015)
Health systems and chronic non-communicable diseases in low- and middle-income countries
In:
de-Graft Aikins, Ama and
Agyemang, C., (eds.)
Chronic non-communicable diseases in low and middle-income countries. CABI, Wallingford, UK. ISBN 9781780643328
Randall, Sara and
Coast, Ernestina
(2015)
Poverty in African households: the limits of survey representations
Journal of Development Studies, 51 (2). 162-177. ISSN 0022-0388
Randall, Sara and
Coast, Ernestina and
Antoine, Philippe and
Compaore, Natacha and
Dial, Fatou-Binetou and
Fanghanel, Alexandra and
Gning, Sadio Ba and
Thiombiano, Bilampoa Gnoumou and
Golaz, Valerie and
Wandera, Stephen Ojiambo
(2015)
UN census ‘households’ and local interpretations in Africa
since Independence
SAGE Open, 5 (2). 1-18. ISSN 2158-2440
Wekesa, Eliud and
Coast, Ernestina
(2015)
Contraceptive need and use among individuals with HIV/AIDS living in the slums of Nairobi, Kenya
International Journal of Gynecology & Obstetrics, 130 (S3). E31-E36. ISSN 0020-7292
Parmar, D. and
Leone, T. and
Coast, E. and
Murray, S. and
Hukin, E. and
Vwalika, B.
(2015)
Cost of abortions in Zambia: a comparison of safe abortion and post abortion care
Global Public Health . ISSN 1744-1692
Coast, Ernestina and
Vwalika, Bellington and
Leone, Tiziana and
Murray, Susan and
Freeman, Emily
(2015)
Induced abortion in Zambia: a comparative
mixed methods analysis of women seeking
safe abortion with those seeking postabortion
care after an unsafe abortion.
In: XXI FIGO World Congress of Gynaecology and Obstetrics, 4 -9 October 2015, Vancouver, Canada
Coast, Ernestina
(2014)
The role of induced abortions in fertility transitions.
In: The fertility transition in the South, 23rd-25th April 2014, Oxford University
Leone, Tiziana and
Coast, Ernestina
(2014)
Demographic change and gender
In:
Desai, Vandana and
Potter, Rob, (eds.)
The companion to development studies. Routledge, London, UK. ISBN 9781444167245
Coast, Ernestina
(2014)
Fertility transitions and induced abortion.
In: The fertility transition in the South, 23rd-25th April, 2014, St Anne's College, Oxford
Coast, Ernestina and
Randall, Sara
(2014)
Exploring the limits of household surveys in Africa
Africa at LSE Blog (10 Nov 2014) Blog entry
Parmar, Divya and
Leone, Tiziana and
Coast, Ernestina and
Hukin, Eleanor and
Murray, Susan and
Vwalika, Bellington
(2014)
Health system costs of safe abortion and post abortion care
from unsafe induced abortions in Zambia.
In: Third International Conference of the African Health Economics and Policy Association (AfHEA) , 11-13 Mar 2014, Nairobi, Kenya
Coast, Ernestina and
Weinberger, Michelle
(2014)
Impact of changes in Tanzania’s family planning policies could benefit other African countries
Africa at LSE Blog (10 Sep 2014) Blog entry
Coast, Ernestina and
Murray, Susan
(2014)
Pregnancy termination trajectories in Zambia.
In: IUSSP International Seminar on Decision-making regarding abortion – determinants and consequences, 3-5 June 2014, Nanyuki, Kenya
Coast, Ernestina and
Murray, Susan
(2014)
Pregnancy termination trajectories in Zambia.
In: IUSSP workshop on decision-making regarding abortion, 3rd-5th June, 2014, Nanyuki, Kenya
Coast, Ernestina and
Murray, Susan
(2014)
Pregnancy termination trajectories in Zambia
IUSSP working papers, International Union for the Scientific Study of Population (IUSSP), Paris, France.
Coast, Ernestina and
Norris, Alison and
Moore, Ann and
Freeman, Emily
(2014)
Trajectories to abortion and abortion-related care: a conceptual framework.
In: International Seminar on Decision-making regarding abortion-determinants and consequences, 3-5 June, 2014, Nanyuki, Kenya
Kriel, Antoinette and
Randall, Sara and
Coast, Ernestina and
de Clercq, Bernadene
(2014)
From design to practice: how can large-scale household surveys better represent the complexities of the social units under investigation?
African Population Studies, 28 (3). 1309-1323. ISSN 0850-5780
Weinberger, Michelle and
Coast, Ernestina
(2014)
Fertility, contraception and method mix in Tanzania: trends and changes since 1990
In:
Mturi, Akim J. and
Agyei-Mensah, Samuel, (eds.)
Explaining fertility differences in sub-Saharan Africa: projecting the demographic future. The Edwin Mellen Press. ISBN 0773442707
Wekesa, Eliud and
Coast, Ernestina
(2014)
Fertility desires among men and women living with HIV/AIDS in Nairobi slums: a mixed methods study
PLOS One, 9 (8). e106292. ISSN 1932-6203
Coast, Ernestina and
Jones, Eleri and
Lattof, Samantha R. and
Portela, Anayda
(2014)
Maternity care services and culture: a systematic global mapping of interventions
PLOS One, 9 (9). e108130. ISSN 1932-6203
Freeman, Emily and
Coast, Ernestina
(2014)
Sex in older age in rural Malawi
Ageing and Society, 34 (7). 1118-1141. ISSN 0144-686X
Parmar, D. and
Leone, Tiziana and
Coast, Ernestina and
Murray, Susan and
Hukin, Eleanor and
Vwalika, Bellington
(2014)
A comparative study of health systems costs of safe abortion and post abortion care in Zambia.
In: Third international conference of the African Health Economics and Policy Association (AfHEA), 11th-13th March, 2014, Nairobi, Kenya
Coast, Ernestina and
Leone, Tiziana and
Malviya, Alankar
(2013)
Gender-based violence and reproductive health in India
India at LSE (23 Jan 2013) Blog entry
Randall, Sara and
Coast, Ernestina
(2013)
The power of the interviewer
Africa at LSE Blog (10 Jun 2013) Blog entry
Wekesa, Eliud and
Coast, Ernestina
(2013)
Living with HIV in Kenyan slums in an era of anti-retroviral therapy (ART)
Africa at LSE Blog (3 May 2013) Blog entry
Wekesa, Eliud and
Coast, Ernestina
(2013)
Fertility intentions among people living with HIV and AIDS (PLWHA) in the ART era: mixed methods evidence from Nairobi slums.
In: Population Association of America 2013 Annual Meeting, 11th-13th April 2013, New Orleans, USA
Coast, Ernestina and
Wigle, Jannah
(2013)
Human papillomavirus (HPV) vaccine – identifying and overcoming the challenges to reaching those who need it most
LSE Health and Social Care Blog (9 Jul 2013) Blog entry
Jones, Eleri and
Coast, Ernestina
(2013)
Social relationships and postpartum depression in South Asia: a systematic review
International Journal of Social Psychiatry, 59 (7). 690-700. ISSN 0020-7640
Coast, Ernestina and
Jones, Eleri and
Hukin, Eleanor and
Kumpunen, Stephanie
(2013)
Systematic mapping of interventions that have been implemented to address cultural factors that affect women's use of skilled maternity care services
World Health Organization / Department of Maternal, Newborn, Child and Adolescent Health.
Randall, Sara and
Coast, Ernestina and
Compaore, Natacha and
Antoine, Philippe
(2013)
The power of the interviewer: a qualitative perspective on African survey data collection
Demographic Research, 28 (27). 763-792. ISSN 1435-9871
Wigle, Jannah and
Coast, Ernestina and
Watson-Jones, Deborah
(2013)
Human Papillomavirus (HPV) vaccine implementation in low and
middle-income countries (LMICs): health system experiences and prospects
Vaccine, 31 (37). 3811-3817. ISSN 0264-410X
Wekesa, Eliud and
Coast, Ernestina
(2013)
Living with HIV post-diagnosis: a qualitative study of the experiences of Nairobi slum residents
BMJ Open, 3 (e00239). 1-10. ISSN 2044-6055
Coast, Ernestina and
Fanghanel, Alex and
Lelievre, Eva and
Randall, Sara
(2013)
Counting the population or describing society?: a comparison of British and French censuses.
In: Chaire Quetelet 2013, 12-15th November 2013, Research Centre in Population and Societies, Catholic University of Louvain, Louvain-la-Neuve, Belgium
Ferrario, Alessandra and
Coast, Ernestina
(2012)
Setting the agenda for global family planning: a pre-summit discussion at the LSE
Health and Social Care at LSE (11 Jul 2012) Blog entry
Coast, Ernestina and
Leone, Tiziana and
Malviya, Alankar
(2012)
Gender-based violence and reproductive health in five Indian states
In:
Nakray, Keerty, (ed.)
Gender-Based Violence and Public Health: International Perspectives on Budgets and Policies. Routledge studies in public health. Routledge, New York, NY. ISBN 9780415504928
Mathews, Paul and
Sear, Rebecca and
Coast, Ernestina and
Iacovou, Maria
(2012)
Do preceding questions influence the reporting of childbearing intentions in social surveys?.
In: Population Association of America Annual Meeting, 3-5 May 2012, San Francisco
Coast, Ernestina and
Leone, Tiziana and
Hirose, Atsumi and
Jones, Eleri
(2012)
Poverty and postnatal depression: a systematic mapping of the evidence from low and lower middle income countries
Health and Place, 18 (5). 1188-1197. ISSN 1353-8292
Puradiredja, Dewi Ismajani and
Coast, Ernestina
(2012)
Transactional sex risk across a typology of rural and urban female sex workers in Indonesia: a mixed methods study
PLOS One, 7 (12). e52858. ISSN 1932-6203
Fanghanel, Alex and
Coast, Ernestina and
Randall, Sara
(2012)
Harmonised households: ménages à ménager (HHMM)
International Social Research Methods Case Studies, 4. National Centre for Research Methods (NCRM), Southampton, UK.
Fanghanel, Alex and
Coast, Ernestina and
Randall, Sara
(2012)
Mapping intergenerational care across households in the UK: analysing proximity, propinquity and resources in the "tacit intergenerational contract".
In: European Population Conference, 13th-16th June 2012, Stockholm, Sweden
Leone, Tiziana and
Coast, Ernestina and
Narayanan, Shilpa and
De-Graft Aikins, Ama
(2012)
Diabetes and depression comorbidity and socio-economic status in low and middle income countries (LMICs): a mapping of the evidence
Globalization and Health, 8 (39). ISSN 1744-8603
Coast, Ernestina and
Randall, Sara and
Fanghanel, Alex and
Lelievre, Eva and
Ba-Gning, Sadio
(2012)
Sofa surfers and shed dwellers: new living arrangements and household surveys in the UK and France.
In: European Population Conference, 13th-16th June 2012, Stockholm, Sweden
Vieira, Claudia and
Portela, Anayda and
Miller, Tina and
Coast, Ernestina and
Leone, Tiziana and
Marston, Cicley
(2012)
Increasing the use of skilled health personnel where traditional birth attendants were providers of childbirth care: a systematic review
PLOS One, 7 (10). 1-9. ISSN 1932-6203
Kriel, Antoinette and
Randall, Sara and
Coast, Ernestina and
Risenga, Arthur and
Nyambura, Melissa
(2012)
From design to practice: how can large-scale household surveys better represent the complexities of the social units under investigation?.
In: XVIII South African Sociological Association Annual Congress: Knowledge, Technologies and Social Change, 1st-4th July 2012, Cape Town, South Africa
Coast, Ernestina and
McDaid, David and
Leone, Tiziana and
Pitchforth, E. and
Matthews, Zoe and
Iemmi, Valentina and
Hirose, Atsumi and
Macrae-Gibson, Rowena and
Secker, Jane and
Jones, Eleri
(2012)
What are the effects of different models of delivery for improving maternal and infant health outcomes for poor people in urban areas in low income and lower middle income countries?
Department for International Development, London. ISBN 978190734525
Iemmi, Valentina and
Coast, Ernestina and
Leone, Tiziana and
McDaid, David
(2011)
Suicide and poverty: mapping the evidence in low and middle income countries.
In: World Congress of the World Federation for Mental Health, 17-21 October 2011, Cape Town, South Africa
Leone, Tiziana and
Bisht, R. and
Goisis, Alice and
Coast, Ernestina
(2011)
Raising overmedicalisation of births in Southern India: a demand or supply phenomenon?.
In: British Society for Population Studies Annual Conference, 7-9 September 2011, York, UK
Coast, Ernestina and
Randall, Sara and
Golaz, Valerie and
Gnoumou, Bilampoa
(2011)
Problematic polygymy: implications of changing typologies and definitions of polygamy.
In: Sixth African Population Conference, 5-9 December 2011, Ouagadougou, Burkina Faso
Randall, Sara and
Coast, Ernestina and
Compaore, Natacha and
Wandera, Stephen Ojiambo
(2011)
The power of the interviewer.
In: Sixth African Population Conference, 5-9 December 2011, Ouagadougou, Burkina Faso
Randall, Sara and
Coast, Ernestina and
Leone, Tiziana
(2011)
Cultural constructions of the concept of household in sample surveys
Population Studies, 65 (2). 217-229. ISSN 0032-4728
Corker, Jamaica and
Coast, Ernestina
(2011)
Polygyny and family planning programs in sub-Saharan Africa: representation and reality.
In: International Conference in Family Planning, 29 Nov - 2nd Dec 2011, Dakar, Senegal
Weinberger, Michelle and
Coast, Ernestina
(2011)
Making sense of Tanzania's fertility: the role of contraceptive use.
In: 2011 International Conference in Family Planning, 29 Nov - 2 Dec 2011, Dakar, Senegal
Coast, Ernestina and
Randall, Sara and
Leone, Tiziana
(2010)
Whose household?: the fuzziness of a critical concept in household surveys.
In: New measurement issues in survey research, 21st September 2010, Royal Statistical Society, London
Leone, Tiziana and
Coast, Ernestina and
Randall, Sara
(2010)
Did you sleep here last night? The impact of the household definition in sample surveys: a Tanzanian case study.
In: European Population Conference, 3-5 September 2010, Vienna
Wekesa, Eliud and
Coast, Ernestina
(2010)
"Just like a taste of water which is too little to quench the thirst": condom use among people living with HIV/AIDS in Nairobi urban slums.
In: 9th International Conference on Urban Health (ICUH), 27-29 October 2010, New York, USA
Coast, Ernestina and
Leone, Tiziana and
McDaid, David and
Hirose, A and
Jones, Eleri
(2010)
Postnatal depression (PND) and poverty in low income countries: mapping the evidence.
In: Reproductive Morbidity and Poverty, 6th November 2010, London School of Economics
Coast, Ernestina
(2010)
The household in surveys: a focus on fuzziness
Ncrm Methodsnews Newsletter, Summer. 5-5.
Coast, Ernestina
(2009)
Currently cohabiting: relationship attitudes, expectations and outcomes
In:
Stillwell, John and
Coast, Ernestina and
Kneale, Dylan, (eds.)
Fertility, Living Arrangements Care and Mobility. Understanding population trends and processes (vol. 1). Springer, Dordrecht, The Netherlands. ISBN 9781402096815
Coast, Ernestina
(2009)
Fertility, living arrangements, care and mobility
In:
Coast, Ernestina and
Stillwell, John and
Kneale, Dylan, (eds.)
Fertility, Living Arrangements Care and Mobility: Understanding Population Trends and Processes. Understanding population trends and processes , 1 (1). Springer, New York, USA, 1-26. ISBN 9781402096815
Coast, Ernestina and
Randall, Sara and
Leone, Tiziana
(2009)
The commodity chain of the household: from survey design to policy and practice
.
In: XXVI IUSSP International Population Conference, 27th September - 2nd October, 2009, Marrakech, Morocco
Coast, Ernestina and
Mondain, Natalie and
Rossier, Clementine
(2009)
Qualitative research in demography: quality, presentation and assessment
.
In: XXVI IUSSP International Population Conference, 27th September - 2nd October, 2009, Marrakech, Morocco
Stillwell, John and
Coast, Ernestina and
Kneale, Dylan
(2009)
Fertility, living arrangements care and mobility: Understanding population trends and processes
Understanding population trends and processes, Vol. 1. Springer, Dordrecht, The Netherlands. ISBN 9781402096815
Leone, Tiziana and
Coast, Ernestina and
Malviya, Alankar
(2008)
Gender based violence and women's vulnerability towards HIV/AIDS in 6 Indian Districts.
In: XVII AIDS Conference, 3-8th August 2008, Mexico City
Coast, Ernestina and
Hampshire, Katherine and
Randall, Sara
(2007)
Disciplining anthropological demography
Demographic Research, 16 (1). 493-518. ISSN 1435-9871
Coast, Ernestina
(2007)
Wasting semen: context and condom use among the Maasai
Culture, Health and Sexuality, 9 (4). 387-401. ISSN 1369-1058
Homewood, K. and
Coast, E. and
Kiruswa, S. and
Serneels, S. and
Thompson, M. and
Trench, P.
(2006)
Maasai pastoralists : diversification and poverty.
In: Pastoralism and Poverty Reduction in East Africa : A Policy Research Conference, 27-28 June 2006, International Livestock Research Institute
Coast, Ernestina
(2006)
Maasai marriage: a comparative study of Kenya and Tanzania
Journal of Comparative Family Studies, 37 (3). 399-420. ISSN 0047-2328
Coast, Ernestina
(2006)
Local understandings of, and responses to, HIV: rural–urban migrants in Tanzania
Social Science and Medicine, 63 (4). 1000 -1010. ISSN 0277-9536
Coast, Ernestina
(2005)
Malthusian demography
In:
Forsyth, Tim, (ed.)
Encyclopaedia of International Development. Routledge, London and New York, 424-425. ISBN 9780415-253420
Coast, Ernestina
(2005)
Maasai marriage: a comparative study of Kenya and Tanzania.
In: International Union for the Scientific Study of Population XXV International Population Conference, 18-23 Jul 2005, Tours, France
Homewood, Catherine and
Thompson, Michael and
Trench, Pippa and
Kiruswa, Steven and
Coast, Ernestina
(2005)
Gestione delle risorse naturali su base comunitaria e statle e livelihood locali nel Maasailand
Afriche e Orienti, 7 (2). 84-101. ISSN 1592-6753
Coast, Ernestina
(2005)
Sexual behaviour and perceptions of risk: male rural-urban migrants in Tanzania.
In: International Union for the Scientific Study of Population XXV International Population Conference, 18-23 Jul 2005, Tours, France
Coast, Ernestina
(2005)
Female genital cutting
In:
Forsyth, Tim, (ed.)
Encyclopaedia of International Development. Routledge, London and New York:, 235-236. ISBN 9780415253420
Coast, Ernestina
(2003)
An evaluation of demographers' use of ethnographies
Population Studies, 57 (3). 337-347. ISSN 1477-4747
Coast, Ernestina
(2003)
Wasting sperm: the cultural context of condom use among the Maasai of Northern Tanzania.
In: International Union for the Scientific Study of Population Workshop on Taking Stock of the Condom in the Era of HIV/AIDS, 13-17 July 2003, University of Botswana
Coast, Ernestina
(2002)
Demography of the Marsh Arabs
In:
Nicholson, E. and
Clark, P., (eds.)
The Iraqi Marshlands : a Human and Environmental Study. Politico's Publishing, London, 19-35. ISBN 1842750429
Coast, Ernestina
(2002)
Maasai socio-economic conditions : cross-border comparison
Human Ecology, 30 (1). 79-105. ISSN 0300-7839
Coast, Ernestina
(2001)
Maasai demography
phd thesis, University of London, University College London
Homewood, K. and
Lambin, E. F. and
Coast, Ernestina and
Kariuki, A. and
Kikula, I. and
Kivelia, J. and
Said, M. and
Serneels, S. and
Thompson, M.
(2001)
Long term changes in African savanna wildlife and land cover : pastoralists or policies
Proceedings of the National Academy of Science, 98 (22). 12544-12549. ISSN 1091-6490