Department of Health & Behavior Studies, Program in Nutrition, Teachers College, Columbia University, New York, New York. Department of Medicine, Celiac Disease Center, Columbia University Medical Center, New York, New York. Department of Medicine, Celiac Disease Center, Columbia University Medical Center, New York, New York; Department of Epidemiology, Mailman School of Public Health, Columbia University Medical Center, New York, New York. Electronic address: BL114@columbia.edu.