1. Department of Surgery, Naval Medical Center San Diego, San Diego, CA 34800 San Diego, CA 92134, USA
2. Department of Surgery, Uniformed Services University of the Health Sciences & the Walter Reed National Military Medical Center, Bethesda, MD 4301 Bethesda, MD 20814, USA
3. Department of Medicine, Naval Medical Center San Diego, San Diego, CA 34800 San Diego, CA 92134, USA
4. Department of Medicine, Uniformed Services University of the Health Sciences, Bethesda, MD 4301 Bethesda, MD 20814, USA