1. Division of Child Development, Department of Pediatrics, King-Drew Medical Center, UCLA School of Medicine, Los Angeles, CA
2. Klinefelter Syndrome and Associates, P.O. Box 119, Roseville, CA
3. Medical Genetics Birth Defects Center, Steven Spielberg Pediatric Research Center, Ahmanson Pediatric Center, SHARE's Child Disability Center, Department of Pediatrics, Cedars-Sinai Medical Center, UCLA School of Medicine, Los Angeles, CA