1. Center for Advanced Laparoscopic & Bariatric Surgery, MedStar Washington Hospital Center and Georgetown University School of Medicine, Washington, District of Columbia, USA.
2. Department of Surgery, Kaiser Permanente Downey Medical Center, Downey, California, USA.
3. Department of Surgery, Eastern Maine Medical Center, Bangor, Maine, USA.
4. Department of Nutrition and Food Science, University of Maryland, College Park, Maryland, USA.
5. Department of Surgery, State University of New York Upstate Medical University, Syracuse, New York, USA.
6. Section of Gastroenterology, Salem VA Medical Center and Virginia Tech Carilion School of Medicine, Salem, Virginia, USA.