1. War Related Illness and Injury Study Center, VA Palo Alto Health Care System, Palo Alto, CA, USA
2. Department of Psychiatry and Behavioral Sciences, Stanford University, Palo Alto, CA, USA
3. Department of Psychiatry and Behavioral Sciences, Mercer University School of Medicine, GA, USA
4. Multivariate Measurement Technology Corporation, Sherman, CT, USA
5. VA Palo Alto Health Care System, Palo Alto, CA, USA