Agency for Health Care Policy and Research, Center for General Health Services Intramural Research ; [prepared by Doris Cadigan Lefkowitz and Carol Underwood]
Agency for Health Care Policy and Research, Center for General Health Services Intramural Research ; [prepared by Peter J. Cunningham and Claudia L. Schur]
Agency for Health Care Policy and Research, Center for General Health Services Intramural Research ; [prepared by Karen M. Beauregard, Peter J. Cunningham and Llewellyn J. Cornelius]