1. Colorectal Center, Lankenau Hospital, Philadelphia, Pennsylvania
2. Division of Colon and Rectal Surgery, University of Minnesota, Minneapolis, Minnesota
3. Section of Colon and Rectal Surgery, Vanderbilt University Medical Center, Nashville, Tennessee
4. The University of Texas MD Anderson Cancer Center, Houston, Texas
5. Anorectal Physiology Department of Rio de Janeiro, CEPEMED, Rio de Janeiro, Brazil
6. Division of Colon and Rectal Surgery, Rutgers University, New Brunswick, New Jersey
7. Department of Colon and Rectal Surgery, Cleveland Clinic, Cleveland, Ohio
8. Division of Colon and Rectal Surgery, University of Cincinnati College of Medicine, Cincinnati, Ohio