1. Division of Infectious Diseases, Naval Medical Center San Diego , San Diego, CA 92134, USA
2. Division of General Surgery, Naval Medical Center San Diego , San Diego, CA 92134, USA
3. Department of Medicine, Uniformed Services University , Bethesda, MD 20814, USA
4. 2nd Medical Battalion, 2nd Marine Logistics Group, Camp Lejeune , Camp Lejeune, NC 28547, USA