1. Division of Colon and Rectal Surgery, Mayo Clinic, Rochester, Minnesota, USA.
2. Department of Surgery, Mayo Clinic, Rochester, Minnesota, USA.
3. Robert D. and Patricia E. Kern Center for the Science of Health Care Delivery, Mayo Clinic, Rochester, Minnesota, USA.
4. Division of Colon and Rectal Surgery, Department of Surgery, Mayo Clinic, Scottsdale, Arizona, USA.