Gordon and Nivatvongs' principles and practice of surgery for the colon, rectum, and anus / David E. Beck, M D, FACS, FASCRS (`Professor and Chairman Emeritus, Department of Colon and Rectal Surgery, Ochsner Clinic Foundation, The University of Queensland School of Medicine-Ochsner Clinical School, New Orleans, Lousiana), Steven D. Wexner, MD, PhD (Hon), FACS, FASCRS, FRCS, FRCS (Ed), FRCSI (Hoon) (Director, Digestive Disease Center, Chair, Department of Colorectal Surgery, Cleveland Clinic Florida, Affiliate Professor, Florida Atlantic Univeristy College of Medicine, Clinical Professor, Florida International University College of Medicine, Professor of Surgery, Ohio State University of College of Medicine, Affiliate Professor, Department of Surgery, Division of General Surgery, University of South Florida Morsani College of Medicine, Weston, Florida), Janice F. Rafferty, MD, FACS, FASCRS (Professor of Surgery, Chief, Colon, Section and Rectal Surgery, University of Cincinnati Department of Surgery, Cincinnati, Ohio), [editors].