1. Bureau of Medicine and Surgery, U.S. Navy, 7700 Arlington Blvd, Suite 5113, Falls Church, VA 22042-5113.
2. Department of Preventive Medicine and Biostatistics, Uniformed Services University, 4301 Jones Bridge Road, Bethesda, MD 20814.
3. Naval Hospital Okinawa, PSC 482 Box 1600 FPO AP, Okinawa 96362-1600, Japan.