1. Melvin D. Levine is chief of Ambulatory Pediatrics at Children's Hospital Medical Center in Boston and associate professor of pediatrics at Harvard Medical Srhool. He received his MD degree from Harvard University.
2. Simon Clarke is director of the Outpatient Department at Westmeade Center in Westmeade, WSW, Australia.
3. Thomas Ferb is former research director of the Brookline Early Education Project at Brookline, Massachusetts. He received his PhD degree in psyichology at Harvard University. Requests for reprints should be addressed to Dr. Levine at Children's Hospital Medical Center, 300 Longwood Ave., Boston. Mass. 02115.