1. Dr. Platt is a professor in and chair of the Department of Ambulatory Care and Prevention, Harvard Medical School and Harvard Pilgrim Health Care, Boston, and principal investigator of the HMO Research Network Center for Education and Research on Therapeutics, Boston, and principal investigator of an FDA contract (HHSF 223200510010C) to perform post-marketing surveillance for drug risks and benefits. Dr. Ommaya is a senior staff member at the Institute of Medicine, Washington D.C.