1. Perelman School of Medicine and School of Nursing, University of Pennsylvania, Philadelphia, Pennsylvania.
2. Department of Biostatistics and Epidemiology, Center for Clinical Epidemiology and Biostatistics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania.
3. Department of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania.
4. Department of Anesthesiology and Critical Care, University of Pennsylvania, Philadelphia, Pennsylvania.
5. Department of Radiology, University of Pennsylvania, Philadelphia, Pennsylvania.
6. Department of Biostatistics and Epidemiology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania.
7. Department of Management, DePaul University, Chicago, Illinois.
8. Department of Management, The Wharton School, University of Pennsylvania, Philadelphia, Pennsylvania.
9. Department of Emergency Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania.