1. Department of Surgery, Uniformed Services University of the Health Sciences , Bethesda, MD 20889, USA
2. Department of Surgery, Walter Reed National Military Medical Center , Bethesda, MD 20889, USA
3. Department of General Surgery, Navy Medicine Readiness and Training Command , Portsmouth, VA 23708, USA
4. Department of Ophthalmology, Navy Medicine Readiness and Training Command , Portsmouth, VA 23708, USA