1. University Center for Social and Urban Research, University of Pittsburgh, Pittsburgh, Pennsylvania, USA
2. Institute for Health and Aging, University of California, San Francisco, San Francisco, California, USA
3. Stanford Center on Longevity, Stanford University, Stanford, California, USA
4. Feinberg School of Medicine, Northwestern University, Evanston, Illinois, USA
5. NORC at The University of Chicago, Chicago, Illinois, USA
6. School of Public Health, University of Illinois at Chicago, Chicago, Illinois, USA