National University Hospital, Division of Gastroenterology, Department of Medicine, Singapore, Singapore
Prince of Wales Hospital, Department of Medicine and Therapeutics, Hong Kong, China
University of Illinois at Chicago, Chicago, Illinois, United States
Dr Robert Wallace, St. Petersburg, Florida, United States
North Shore Univ Hosp, Great Neck, New York, United States
Dr Robert Wallace, St. Petersburg, Florida, United States
East Bay Clinical Trial Ctr, Concord, California, United States
Orange Coast Med Group, Newport Beach, California, United States
Health Positive, Safety Harbor, Florida, United States
Northstar Med Clinic, Chicago, Illinois, United States
Houston Clinical Research Network, Houston, Texas, United States
Univ of Texas / Med School at Houston, Houston, Texas, United States
USC School of Medicine / LA County Med Ctr, Los Angeles, California, United States
Univ of Miami, Miami, Florida, United States
Instituto Mexicano de Investigacion Clinica, Col Roma, Mexico
Anderson Clinical Research, Pittsburgh, Pennsylvania, United States