1. Department of Psychiatry and Behavioral Sciences, University of California, San Francisco, San Francisco, California, USA.
2. VA Portland Health Care System, Portland, Oregon, USA.
3. Oregon Health & Science University, Portland, Oregon, USA.
4. College of Osteopathic Medicine of the Pacific, Western University of Health Sciences, Pomona, California, USA.
5. San Francisco VA Medical Center, San Francisco, California, USA.