*From the Division of General Medicine (Section on Health Services and Policy Research), Department of Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, Massachusetts.
†From the Department of Health Care Policy, Harvard Medical School, Boston, Massachusetts.
‡From the Institute for Health Policy, Massachusetts General Hospital, Boston, Massachusetts.
§From Boston Biostatistics, Inc., Framingham, Massachusetts.
#From the Department of Health Policy and Management, Harvard School of Public Health, Boston, Massachusetts.
This study was supported by a grant (HS 06631) from the Agency for Health Care Policy and Research.
Dr. Ayanian is a Robert Wood Johnson Foundation Generalist Physician Faculty Scholar and was a Medical Foundation/Charles A. King Trust Research Fellow when this work was initiated.
Address correspondence to: John Z. Ayanian, MD, MPP, Department of Health Care Policy, Harvard Medical School, 180 Longwood Avenue, Boston, MA 02115. E-mail: [email protected]
Received April 6, 1999; initial review completed May 18, 1999; accepted June 22, 1999.