Division of Pediatric Endocrinology, Diabetes and Metabolism, Columbia University Irving Medical Center, New York, New York, USA, cfp2120@cumc.columbia.edu. Department of Biostatistics, Mailman School of Public Health, Columbia University Irving Medical Center, New York, New York, USA. Division of Pediatric Endocrinology, Diabetes and Metabolism, Columbia University Irving Medical Center, New York, New York, USA. Institute of Human Nutrition, Columbia University Irving Medical Center, New York, New York, USA. Center for Women's Health Research, Aurora, Colorado, USA. Division of Pediatric Endocrinology, Department of Pediatrics, University of Colorado Anschutz Medical Campus and Children's Hospital Colorado, Aurora, Colorado, USA.