1. Center for Weight and Eating Disorders, Department of Psychiatry, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
2. Center for Clinical Epidemiology and Biostatistics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
3. Department of Physical Therapy, D’Youville College, Buffalo, NY 14201, USA
4. Division of Maternal-Fetal Medicine, University of Washington Medical Center, Seattle, WA 98195, USA