Department of Nutrition, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina. Department of Epidemiology, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina. Department of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina. School of Nursing, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina. Department of Pediatrics, School of Medicine, Stanford University, Stanford, California. Stanford Diabetes Research Center, Stanford University, Stanford, California. Department of Biostatistics, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina. Department of Statistics and Operations Research, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina.