1. Assistant Professor, Department of Anesthesiology, University of Colorado Medical Center, Aurora, CO, USA
2. Department of Biostatistics, Columbia University Mailman School of Public Health, New York, NY, USA
3. Clinical Officer, Department of Anesthesiology, Kamuzu Central Hospital, Lilongwe, Malawi
4. Professor, Department of Anesthesiology, Columbia University College of Physicians and Surgeons, New York, NY, USA
5. Professor, Department of Epidemiology, Columbia University Mailman School of Public Health, New York, NY, USA
6. Professor, Department of Surgery, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA