1. Department of Medicine and the Palliative and Advanced Illness Research Center, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania, USA.
2. Department of Medicine and University of California San Francisco, San Francisco, California, USA.
3. Department of Surgery, University of California San Francisco, San Francisco, California, USA.
4. Department of Surgery, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania, USA.
5. Division of Trauma, Critical Care, Burns, and Acute Care Surgery, MetroHealth Medical Center, Cleveland, Ohio, USA.
6. Department of Population and Quantitative Health Sciences, Case Western Reserve University School of Medicine, Cleveland, Ohio, USA.
7. Department of Surgery, University of Wisconsin–Madison, Wisconsin, USA.
8. Department of Surgery, University of Washington, Harborview Medical Center, Seattle, Washington, USA.
9. Centre on Aging and Mobility, University Hospital Zurich and City Hospital Waid Zurich, Zurich, Switzerland.
10. University Clinic for Acute Geriatric Care, City Hospital Waid Zurich, Zurich, Switzerland.
11. Department of Surgery, Terre Haute Regional Hospital, Indiana University School of Medicine, Terre Haute, Indiana, USA.
12. Department of Medicine, Duke University, Durham, North Carolina, USA.
13. Department of Surgery, Perelman School of Medicine, University of Pennsylvania and the Corporal Michael J. Crescenz Veterans Affairs Medical Center, Philadelphia, Pennsylvania, USA.
14. Division of Traumatology, Surgical Critical Care and Emergency Surgery, Department of Surgery, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania, USA.