1. Department of Epidemiology and Center for Social Epidemiology and Population Health, University of Michigan School of Public Health, Ann Arbor, Michigan, USA
2. Institute for Demographic Research, City University of New York, New York, New York, USA
3. Woodrow Wilson School of Public and International Affairs and Office of Population Research, Princeton University, Princeton, New Jersey, USA
4. School of Public Health, Hunter College, City University of New York, New York, New York, USA