1. Duke University Medical Center, Durham, North Carolina.
2. University of California, Los Angeles, Los Angeles, California.
3. New York University Child Study Center, New York, New York.
4. University of California, Irvine, Irvine, California.
5. McMaster University, Hamilton, Ontario, Canada.
6. National Institute of Mental Health, Bethesda, Maryland.
7. Johns Hopkins University, Baltimore, Maryland.
8. New York State Psychiatric Institute/Columbia University, New York, New York.
9. University of Arizona, Tucson, Arizona.
10. Formerly at New York State Psychiatric Institute/Columbia University.