Proceedings of a workshop held on May 3-4, 1989, supported by the Howard Hughes Medical Institute and the National Center for Health Services Research of the Department of Health and Human Services (grant 5 RO9 HS055 26 02).
Includes bibliographical references.
Electronic reproduction. Ann Arbor, MI : ProQuest, 2015. Available via World Wide Web. Access may be limited to ProQuest affiliated libraries.