1 Philip R. Lee Institute for Health Policy Studies, University of California, San Francisco, San Francisco, CA 94158, United States.
2 Institute for Health, Health Care Policy and Aging Research & School of Nursing, Rutgers, The State University of New Jersey, New Brunswick, NJ, United States.
3 Department of Clinical Epidemiology, Aarhus University and Aarhus University Hospital, 8200 Aarhus N, Denmark.
4 Department of Health Law, Policy and Management, School of Public Health, Boston University, Boston, MA 02118, United States.
5 Department of Epidemiology and Biostatistics, School of Public Health, Boston University, Boston, MA 02118, United States.
6 Department of Epidemiology, School of Public Health, University of Washington, Seattle, WA 98195, United States.
7 Clinical Excellence Research Center, School of Medicine, Stanford University, Stanford, CA 94305, United States.
8 Department of Social and Behavioral Sciences, Harvard T.H. Chan School of Public Health, Harvard University, Boston, MA 02115, United States.