1. Centre on Aging and Mobility, University Hospital Zurich and City Hospital Waid Zurich, Zurich, Switzerland.
2. University Clinic for Acute Geriatric Care, City Hospital Waid Zurich, Zurich, Switzerland.
3. Advanced Heart Failure/Transplantation, Philadelphia VA Medical Center, Hospital of the University of Pennsylvania, Philadelphia, Pennsylvania, USA.
4. Section of Palliative Care and Medical Ethics, Department of General Medicine, Pittsburgh, Pennsylvania, USA.
5. Division of Renal-Electrolyte, University of Pittsburgh School of Medicine, UPMC Health System, Pittsburgh, Pennsylvania, USA.
6. Department of Surgery, University of North Dakota School of Medicine and Health Sciences, Fargo, North Dakota, USA.
7. Duke Cancer Institute, Duke University, Durham, North Carolina, USA.
8. Duke Fuqua School of Business, Duke University, Durham, North Carolina, USA.
9. Center for Palliative and Supportive Care, Division of Gerontology, Geriatrics, and Palliative Care, Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama, USA.
10. Department of Medicine, Division of Gerontology, Geriatrics and Palliative Care, University of Alabama at Birmingham, Birmingham, Alabama, USA.
11. Division of Pulmonary and Critical Care Medicine, University of North Carolina, Chapel Hill, North Carolina, USA.
12. Department of General, Visceral, Vascular and Transplant Surgery, University Hospital Magdeburg, Magdeburg, Germany.
13. Department of Medicine, Brigham and Women's Hospital and Veterans Affairs Boston Healthcare System, Harvard Medical School, Boston, Massachusetts, USA.
14. Department of Medicine, Duke University School of Medicine, Durham, North Carolina, USA.