1. U.S. Air Force School of Aerospace Medicine, 2510 5th Street, Building 840, Wright-Patterson Air Force Base, OH 45433.
2. Decypher Technologies, 200 Concord Plaza Drive 500; San Antonio, TX 78216.
3. Division of Preventive, Occupational, and Aerospace Medicine, Mayo Clinic, 200 First Street SW, Rochester, MN 55905.