1 W. G. Henderson, R. A. Meguid, K. E. Hammermeister, K. L. Colborn, P. D. Rozeboom, M. R. Bronsert, A. Lambert-Kerzner, Surgical Outcomes and Applied Research Program, University of Colorado School of Medicine, Aurora, CO, USA.
2 W. G. Henderson, Department of Biostatistics and Informatics, Colorado School of Public Health, Aurora, CO, USA.
3 W. G. Henderson, R. A. Meguid, K. E. Hammermeister, K. L. Colborn, M. R. Bronsert, A. Lambert-Kerzner, Adult and Child Center for Health Outcomes Research and Delivery Science, University of Colorado School of Medicine, Aurora, CO, USA.
4 R. A. Meguid, K. L. Colborn, R. D. Rozeboom, Department of Surgery, University of Colorado School of Medicine, Aurora, CO, USA.
5 K. E. Hammermeister, Division of Cardiology, Department of Medicine, University of Colorado School of Medicine, Aurora, CO, USA.