1 Department of Sociomedical Sciences, Mailman School of Public Health, Columbia University, 722 West 168th Street, Room 549.B, New York, NY10032, United States.
2 Department of Sociology, University of Nebraska-Lincoln, Lincoln, NE, United States.
3 Department of Sociology, University of Pennsylvania, Philadelphia, PA, United States.
4 RAND Corporation, Santa Monica, CA, United States.
5 Department of Health Policy and Management, Mailman School of Public Health, Columbia University, New York, NY, United States.
6 Department of Family Medicine, University of Rochester Medical Center, Rochester, NY, United States.