1. From the Section of Neurosurgery (J.T.K.), VA Connecticut Healthcare System, West Haven, Conn and the Department of Neurosurgery (J.T.K.), Yale University, New Haven, Conn; the Section of Outcomes Research (J.T.), Division of General Internal Medicine, Department of Internal Medicine, University of Cincinnati Medical Center, Cincinnati, Ohio, the Center for Clinical Effectiveness (J.T.), Institute for Health Policy and Health Services Research, Cincinnati, Ohio, and Veterans Affairs Medical Center ...