About the Author: Mary R. Kwann, MD, MPH, Assistant Professor, Division of Colon and Rectal Surgery, Department of Surgery. Board certified in both Surgery & Colon and Rectal Surgery, she specializes in colon and rectal surgery at University of Minnesota. With an MD from Harvard Medical School Dr Kwaan completed her residency at Brigham and Women's Hospital, Boston, MA in General Surgery, then completed her Fellowship at the University of Minnesota in Colon and Rectal Surgery), along with her MS at Harvard School of Public Health, Boston, MA.Andrew P. Zbar, MB BS, FRCS (Ed.), FRCS (Gen.), FRACS, FSICCR (Hon) Professor of General and Colorectal Surgery. Trained in Australia and the United Kingdom with postgraduate colorectal work in anorectal physiology and colorectal cancer immunology and immunotherapy. Professor of Surgery Chaim Sheba Medical Centre Israel and Senior Postgraduate Anatomy tutor Melbourne Australia.