1. Professor and Director, Center for Health Policy and Outcomes in Anesthesia and Critical Care, Department of Anesthesiology.
2. Epidemiologist, Office of Analysis and Epidemiology, National Center for Health Statistics, Centers for Disease Control and Prevention, Hyattsville, Maryland.
3. Research Assistant.
4. Statistician, Department of Biostatistics, Columbia University Mailman School of Public Health, New York, New York.
5. Professor, Department of Anesthesiology, Columbia University College of Physicians and Surgeons.