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