Salix Investigational Site, Cheltenham, Gloucestershire, United Kingdom
Pfizer Investigational Site, Mexico City DF, Mexico
Progenics Pharmaceuticals, Inc, Tarrytown, New York, United States
Colon & Rectal Surgery Associates, Minneapolis, Minnesota, United States
University of California, San Francisco, Center for Pelvic Physiology, Dept. of Surgery, San Francisco, California, United States
Lahey Clinic, Department of Colon & Rectal Surgery, Burlington, Massachusetts, United States
Registry, Philadelphia, Pennsylvania, United States