作者单位:Naval Med Ctr San Diego, Div Allergy & Immunol, Dept Internal Med, San Diego, CA USA[1]Naval Hlth Res Ctr, Deployment Hlth Res Dept, 140 Sylvester Rd, San Diego, CA 92106 USA[2]Vet Affairs Puget Sound Hlth Care Syst, Seattle Epidemiol Res & Informat Ctr, Seattle, WA USA[3]Mil Med Inc, Henry M Jackson Fdn Adv, Bethesda, MD USA[4]