1. Boston VA Healthcare System and Division of Endocrinology; Diabetes, and Metabolism, Department of Medicine; Beth Israel Deaconess Medical Center; Harvard Medical School; Boston; Massachusetts; USA
2. Department of Biostatistics; Harvard School of Public Health; Boston; Massachusetts; USA
3. Obesity Prevention Program; Department of Population Medicine; Harvard Medical School and Harvard Pilgrim Health Care Institute; Boston; Massachusetts; USA
4. Division of Maternal Fetal Medicine; Brigham and Women's Hospital; Harvard Medical School; Boston; Massachusetts; USA