1. Professor of Anesthesiology and Obstetrics and Gynecology, Department of Anesthesiology, the University of Texas Medical School at Houston.
2. Orebro Medical Center Hospital, Orebro, Sweden.
3. Resident in Anesthesiology, the University of Texas Medical School at Houston.
4. Assistant Professor, Department of Anesthesiology, Baylor College of Medicine at Houston, Houston, Texas.