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. Division of Pulmonary, Allergy, and Critical Care Medicine, Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama, USA.
4. Department of Medicine, Lung Health Center, University of Alabama at Birmingham, Birmingham, Alabama, USA.
5. Division of Gerontology, Geriatrics, and Palliative Care, Department of Medicine, Center for Palliative and Supportive Care, University of Alabama at Birmingham, Birmingham, Alabama, USA.
6. Department of Medicine, Center for Outcomes and Effectiveness Research and Education, University of Alabama at Birmingham, Birmingham, Alabama, USA.
7. University Research Priority Program “Dynamics of Healthy Aging,” University of Zurich, Zurich, Switzerland.
8. Department of Radiation Oncology, Competence Center for Palliative Care, University Hospital Zurich and University of Zurich, Zurich, Switzerland.
9. Division of Palliative Medicine, Department of Geriatrics and Rehabilitation, University of Geneva, University Hospital Geneva, Geneva, Switzerland.
10. Interdisciplinary Center for Health Sciences, Institute for History and Ethics of Medicine, Martin Luther University, Halle-Wittenberg, Germany.
11. Division of Gerontology, Geriatrics and Palliative Care, Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama, USA.
12. Division of Hematology Oncology, Department of Medicine, Ruth and Raymond Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA.
13. Department of Medicine, Duke University School of Medicine, Durham, North Carolina, USA.