1. Department of Medicine (S.H.G., A.S.D., D.V., P.O.), Johns Hopkins University, Baltimore, Maryland 21205
2. Department of Epidemiology (S.H.G., M.S.), Johns Hopkins University, Baltimore, Maryland 21205
3. Department of Preventive Medicine (S.G., K.L.), Feinberg School of Medicine, Northwestern University, Chicago, Illinois 60611
4. Divisions of Endocrinology, Metabolism and Molecular Medicine (P.K.), Feinberg School of Medicine, Northwestern University, Chicago, Illinois 60611