1. Department of Health Policy and Management, Mailman School of Public Health, Columbia University, New York, New York 10032
2. Department of Marketing and International Business, Zicklin School of Business, Baruch College, City University of New York, New York, New York 10010
3. Department of Global Health and Population, Harvard T.H. Chan School of Public Health, Harvard University, Boston, Massachusetts 02115
4. Department of Health Policy and Management, Mailman School of Public Health, Columbia University, New York, New York 10032; and Center for Family and Community Medicine, Columbia University Medical Center, New York, New York 10032