1. Department of Medicine, Philadelphia Veterans Affairs Medical Center, Philadelphia
2. University of Pennsylvania, School of Medicine, Philadelphia
3. Center for Clinical Epidemiology and Biostatistics, University of Pennsylvania, Philadelphia
4. Department of Epidemiology, Graduate School of Public Health, University of Pittsburgh, Pennsylvania
5. Division of General Internal Medicine, University of California at San Francisco, San Francisco, California
6. Department of Pediatrics and Medicine, Stanford University, Stanford
7. Children’s Hospital of Philadelphia, Philadelphia
8. Division of Endocrinology and Diabetes, Golisano Children’s Hospital, University of Rochester, Rochester
9. Laboratory of Epidemiology and Population Sciences, Intramural Research Program, NIA, NIH, Bethesda, Maryl