Affiliation: | (1) Kallir Philips Ross, Inc., 605 Third Avenue, 10158 New York, New York;(2) Department of Human Genetics and Development and the Cancer Center/Institute for Cancer Research, Columbia University College of Physicians and Surgeons, 10032 New York, New York;(3) The Population Council, 1230 York Avenue, 10021 New York, New York |