1. Department of Neurology University of Pennsylvania Perelman School of Medicine Philadelphia Pennsylvania USA
2. Department of Biostatistics, Epidemiology, and Informatics University of Pennsylvania Perelman School of Medicine Philadelphia Pennsylvania USA
3. Center for Clinical Epidemiology and Biostatistics University of Pennsylvania Perelman School of Medicine Philadelphia Pennsylvania USA
4. Department of Anesthesiology and Critical Care Medicine Johns Hopkins Medical Institutions Baltimore Maryland USA
5. Department of Medicine Beth Israel Deaconess Medical Center, and Harvard Medical School Boston Massachusetts USA
6. Department of Epidemiology and Public Health University of Maryland School of Medicine Baltimore Maryland USA
7. Division of General Internal Medicine Rutgers Robert Wood Johnson Medical School New Brunswick New Jersey USA
8. Department of Anesthesiology and Pain Medicine University of Alberta Edmonton Canada
9. Department of Outcomes Research Cleveland Clinic Cleveland Ohio USA
10. Center for Advocacy for the Rights and Interests of the Elderly Philadelphia Pennsylvania USA
11. Department of Orthopaedics University of British Columbia Vancouver Canada
12. Division of Orthopaedics Ottawa Hospital Civic Campus Ottawa Canada
13. Department of Anesthesiology Sidney Kimmel Medical College at Thomas Jefferson University Philadelphia Pennsylvania USA
14. Department of Anesthesiology New York University Langone Medical Center New York New York USA
15. Department of Anesthesiology Wake Forest School of Medicine Winston‐Salem North Carolina USA
16. Department of Anesthesiology University of Pittsburgh Medical Center Pittsburgh Pennsylvania USA
17. Department of Anesthesiology Lahey Hospital and Medical Center Burlington Massachusetts USA
18. Department of Anesthesiology Stony Brook University Stony Brook New York USA
19. Department of Orthopedic Surgery Inova Fairfax Medical Campus Falls Church Virginia USA
20. Department of Anesthesiology and Pain Medicine University of Toronto Toronto Canada
21. Department of Anesthesiology Hartford Hospital Hartford Connecticut USA
22. Department of Internal Medicine Peacehealth Medical Group Springfield Oregon USA
23. Department of Anesthesiology University of Florida College of Medicine Gainesville Florida USA
24. Department of Anesthesiology Lewis Katz School of Medicine at Temple University Philadelphia Pennsylvania USA
25. Department of Anesthesiology University of Vermont Larner College of Medicine Burlington Vermont USA
26. Department of Internal Medicine, Division of Geriatric Medicine, Perelman School of Medicine University of Pennsylvania Perelman School of Medicine Philadelphia Pennsylvania USA
27. Department of Orthopaedic Surgery, Perelman School of Medicine University of Pennsylvania Perelman School of Medicine Philadelphia Pennsylvania USA
28. Department of Anesthesiology and Critical Care, Perelman School of Medicine University of Pennsylvania Perelman School of Medicine Philadelphia Pennsylvania USA