Rex E Atwood1, Matthew J Bradley1, Eric A Elster2. 1. Walter Reed National Military Medical Centre, Bethesda, MD, USA; Department of Surgery, Uniformed Services University of Health Sciences, Bethesda, MD 20814, USA. 2. Department of Surgery, Uniformed Services University of Health Sciences, Bethesda, MD 20814, USA. Electronic address: eric.elster@usuhs.edu.