1. Department of Psychiatry, Southern Illinois University School of Medicine, Springfield 62708
2. Rhode Island Psychiatric Research and Training Center, Cranston 02920, Department of Neuroscience, Brown University, Providence, Rhode Island 02912, and Department of Pharmacology and Toxicology, University of Rhode Island, Kingston 02881
3. Department of Psychiatry, Roger Williams General Hospital, Brown University
4. Department of Medicine, Roger Williams General Hospital