Making Health Care a Market: Evidence from Cleveland Clinic, Stanford Health Care, Geisinger, and University of Utah Health Care (first author, with Susannah Rose, Adrienne Boissy, Greg Burke, Paul Heidenreich, Charlton Park, Paul Maggio, Paul Sommer, Susan Gehrum, Pravene Nath, Kenny Shum, Carlos Montalvo, Candice Crawford, Jeffrey Young, Daniel Bokar, and Vivian Lee)