For more information, contact: Richard Deyo, MD, Director, Health Services Research and Development, 1660 S. Columbian Way, Seattle, Wash. 98108; or Martti Kormano, MD, Department of Diagnostic Radiology, University Central Hospital, SF-20520 Turku, Finland; or Marc A. Linson, MD, 300 Carew St., Springfield, Mass. 01104.
