[1] Madigan Army Med Ctr Ophthalmol Clin, Ft Lewis, WA USA
[2] USN, Air Warfare Ctr, Div Aircraft, Patuxent River, MD USA
[3] Univ Texas Med Branch, Dept Prevent Med & Community Hlth, Galveston, TX USA
[4] USN, Inst Aviat Med, Pensacola, FL USA
[5] Natl Naval Med Ctr, Dept Anesthesiol, Bethesda, MD USA