1 Department of Health and Behavior Studies, Program in Nutrition, Teachers College, Columbia University, 525 West 120th Street, Box 137, New York, NY, 10027, USA. wolf@tc.columbia.edu.
2 Department of Medicine, Celiac Disease Center, Columbia University Medical Center, Harkness Pavilion, 180 Fort Washington Avenue, New York, NY, 10032, USA.
3 Department of Health and Behavior Studies, Program in Nutrition, Teachers College, Columbia University, 525 West 120th Street, Box 137, New York, NY, 10027, USA.
The original version of the article unfortunately contained formatting errors in Table 3. The correct version of Table 3 is given in the Correction article.