1. From the Departments of Behavioral Science and of Preventive Medicine and Biostatistics, University of Toronto, and the Ontario Cancer Foundation, Toronto, Ont.; the Clinical Trials Division, McGill Cancer Center, McGill University, Montreal, Que.; and the National Surgical Adjuvant Breast Project, University of Pittsburgh. Address reprint requests to Dr. Taylor at the Department of Behavioral Science, University of Toronto, McMurrich Bldg., Toronto, ON M5S 1A8, Canada.