1. Lecturer, Department of Obstetrics and Gynecology, University of Leicester, Leicester, U.K.; formerly Research Fellow in Anesthesia, Harvard Medical School, Boston City Hospital
2. Research Assistant, Anesthesia Research Laboratory, Boston City Hospital
3. Associate in Medicine, formerly Associate in Anesthesia, Harvard Medical School
4. Professor and Associate Chairman, Department of Anesthesiology Boston University School of Medicine; Clinical Director, Department of Anesthesiology, and Director, Anesthesia Research Laboratory, Boston City Hospital, Boston, Massachusetts 02118