Brigham and Women's Hospital, Boston, Massachusetts, United States
University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania, United States
University of Virginia School of Medicine, Charlottesville, Virginia, United States
Taipei Blood Center Taiwan Blood Service Foundation (TBSF), Taipei, Taiwan
Atlanta Gastroenterology Associates, Atlanta, Georgia, United States
South Denver Gastroenterology, Englewood, Colorado, United States
University of Florida, Gainesville, Florida, United States
Mathare North City Clinic, Nairobi, Kenya
Pfizer Investigational Site, Montreal, Quebec, Canada
Ohio State University Medical Center, Columbus, Ohio, United States
Fred Hutchinson Cancer Research Center/University of Washington Cancer Consortium, Seattle, Washington, United States
Retina Associates of Cleveland, Beechwood, Ohio, United States