1 Section Colon and Rectal Surgery, University of Virginia, P.O. Box 800709, Charlottesville, VA 22908-0709, USA. Electronic address: th8q@hscmail.mcc.virginia.edu.
2 Department of Surgery, Division of Acute Care Surgery and Outcomes Research, University of Virginia, P.O. Box 800709, Charlottesville, VA 22908-0709, USA. Electronic address: rws2k@hscmail.mcc.virginia.edu.