[1] Vet Affairs Palo Alto Hlth Care Syst, Palo Alto, CA USA
[2] Stanford Sch Med, Dept Psychiat & Behav Sci, Stanford, CA USA
[3] US Dept Vet Affairs, Epidemiol Program, Post Deployment Hlth Serv 12POP5, Off Patient Care Serv, Washington, DC USA
[4] US Dept Vet Affairs, Epidemiol Program 12POP5, Off Patient Care Serv, Hlth Outcomes Mil Exposures, Washington, DC USA
[5] Palo Alto Hlth Care Syst, Sierra Pacific MIRECC 151Y, 3801 Miranda Ave, Palo Alto, CA 94304 USA