1. Department of Anesthesiology and Pain Medicine, Naval Hospital Okinawa , Okinawa 96362, Japan
2. Naval Biotechnology Group, Naval Medical Center Portsmouth , Portsmouth, VA 23507, USA
3. Michaud Role 2 Expeditionary Medical Facility , Camp Lemonnier 09363, Djibouti
4. III Marine Expeditionary Force , Okinawa 96362, Japan
5. Department of Surgery, Naval Hospital Okinawa , Okinawa 96362, Japan
6. Department of Orthopaedic Surgery, Naval Hospital Okinawa , Okinawa 96362, Japan
7. Department of Cardiology, Naval Hospital Okinawa , Okinawa 96362, Japan