1. Department of Obstetrics and Gynecology, The University of Medicine and Dentistry of New Jersey-SOM, Camden, NJ
2. Division of Gastroenterology and Nutrition, The University of Pennsylvania School of Medicine, Philadelphia, PA
3. the Campbell Institute of Research and Technology, Campbell Soup Company, Camden, NJ
4. Section of Adolescent Medicine, The Children's Hospital of Philadelphia, The University of Pennsylvania School of Medicine, Philadelphia, PA