Medical Associates Research Group, San Diego, California, United States
SDG Clinical Research, San Diego, California, United States
Gastro SB, Chula Vista, California, United States
Springfield Clinic, Springfield, Illinois, United States
Ochsner Clinic Foundation, New Orleans, Louisiana, United States
University of Pennsylvania Perelman Center for Advanced Medicine, Philadelphia, Pennsylvania, United States
California Liver Research Institute, Pasadena, California, United States
USC Keck Medical Center, Los Angeles, California, United States
Geisinger Health System, Danville, Pennsylvania, United States
Rutgers University Hospital, New Brunswick, New Jersey, United States
Beaumont Health System, Royal Oak, Michigan, United States
Kaiser Permanente Center for Health Research, Portland, Oregon, United States
Geisinger Clinic, Danville, Pennsylvania, United States
Clinical Research of Puerto Rico, San Juan, Puerto Rico
PMI Research, Atlanta, Georgia, United States
Palm Springs Research Institute, Inc, Miami, Florida, United States
Kaiser Permanente Northwest, Portland, Oregon, United States
Kaiser Permanente Georgia, Atlanta, Georgia, United States
GI Care Center, Miami, Florida, United States
Digestive Care, Boca Raton, Florida, United States
Charlottesville Medical Research, Charlottesville, Virginia, United States
Department of Visceral-, Thoracic- and Vascular Surgery, University Hospital Carl Gustav Carus, Dresden, Germany
Department of Surgery and Surgical Oncology, Charité Campus Berlin Buch, Berlin, Germany
Department of Surgery, University Hospital Schleswig-Holstein, Campus Lübeck, Lübeck, Germany