1. Research Fellow, Department of Anesthesiology, University of Texas Medical School at Houston; current address: Department of Anesthesiology, St. Michael's Hospital, Toronto, Canada.
2. Visiting Research Assistant Professor, Department of Anesthesiology, University of Texas Medical School at Houston; current address: Department of Anesthesiology, University of Oslo, Oslo, Norway.
3. Professor, Department of Anesthesiology, University of Texas Medical School at Houston.
4. Associate Professor, Department of Medicine, Baylor College of Medicine.
5. Research Assistant Professor, Department of Anesthesiology, Baylor College of Medicine.