1. Assistant Professor, Department of Anesthesia, University of California, San Francisco Medical Center, San Francisco, California.
2. Professor, Department of Anesthesiology, University of California, San Francisco Medical Center.
3. Research trainee (Lederle Fellow), Department of Anesthesia, University of California, San Francisco Medical Center. Present address: American University, Beirut, Lebanon.
4. Captain. United States Naval Hospital, San Diego, California.
5. Assistant Professor, Department of Anesthesiology, University of Virginia, School of Medicine, Charlottesville, Virginia. Present address: Department of Anesthesia, University of California, Davis, California.
6. Research trainee, Department of Anesthesia, University of California, San Francisco Medical Center. Present address: Department of Anesthesia, Stanford University, Stanford, California.