1. Mental Health Service (116B), San Francisco VA Medical Center, San Francisco, California, USA
2. Department of Psychiatry, University of California, San Francisco, California, USA
3. Massachusetts General Hospital, Boston, Massachusetts, USA
4. Harvard Medical School, Massachusetts, USA
5. Department of Psychology, University at Buffalo, State University of New York, Buffalo, New York, USA
6. VA Pittsburgh Healthcare System, University Drive C, Pittsburgh, Pennsylvania, USA