1. Univ. of Cincinnati Med. Cntr., Dept. of Emergency Med., 1509 Med. Sci. Bldg., P.O. Box 670769, 231 Bethesda Ave., Cincinnati, OH 45267-0769; Joint Military Med. Cntrs. Emergency. Med. Residency and Dept. of Pathol., Wilford Hall Med. Cntr., San Antonio, TX