1 Department of Psychiatry and Behavioral Sciences, Duke University Medical Center, Durham, North Carolina.
2 Department of Psychiatry and Biobehavioral Sciences, Jane and Terry Semel Institute for Neuroscience and Human Behavior, University of California, Los Angeles, Los Angeles.
3 Miller School of Medicine, University of Miami, Miami, Florida.
4 Research Service, Bruce W. Carter VA Medical Center, Miami, Florida.