1. Center for Social Epidemiology and Population Health; Department of Epidemiology; University of Michigan; Ann Arbor Michigan USA
2. Division of General Internal Medicine; Northwestern University Feinberg School of Medicine; Chicago Illinois USA
3. Northeastern University; Bouve College of Health Sciences; Boston Massachusetts USA
4. National Heart, Lung, and Blood Institute; National Institutes of Health; Bethesda Maryland USA
5. Collaborative Health Studies Coordinating Center; University of Washington; Seattle Washington USA