1. Department of Geriatrics, Faculty of Medicine and Health Sciences, Ghent University Hospital, Ghent, Belgium
2. Drug Quality and Registration group, Faculty of Pharmaceutical Sciences, Ghent University, Ghent, Belgium
3. Unit for Molecular Immunology and Inflammation, VIB-Center for Inflammation Research, Ghent, Belgium
4. Clinical Research Unit, Brugmann University Hospital, Brussels, Belgium
5. WHO Collaborating Center for Public Health Aspects of Musculoskeletal Health and Aging, Division of Public Health, Epidemiology, and Health Economics, University of Liège, Liège, Belgium
6. Geriatrics Department, Rehabilitation Research Group, Hospital del Mar Medical Research Institute, Barcelona, Spain
7. Department of Internal Medicine and Gerontology, Faculty of Medicine, Jagiellonian University Medical College, Kraków, Poland
8. Physical Medicine and Rehabilitation Department, Rehabilitation Research Group, Hospital del Mar Medical Research Institute, Universitat Autònoma de Barcelona, Catalonia, Spain
9. Department of Healthcare for Older People, Royal Devon & Exeter NHS Foundation Trust, Exeter, UK
10. University of Exeter Medical School, Exeter, UK
11. Agaplesion Bethesda Clinic Ulm, Ulm, Germany
12. Geriatric Center Ulm/Alb-Donau, Ulm University, Ulm, Germany
13. Department of Epidemiology, Boston University School of Public Health, Boston, USA
14. Faculty of Medicine, University Hospital Hradec Králové, Hradec Králové, Czech Republic
15. Institute of Clinical Rehabilitation, University School of Physical Education, Kraków, Poland
16. Centro Hospitalar Lisboa Central, Hospital de Santa Marta, Lisbon, Portugal
17. Physical Medicine and Rehabilitation Department, National Institute of Physical Medicine and Rehabilitation (INMFER), Panama city, Panama
18. Division of Geriatrics, Department of Internal Medicine, Istanbul University, Istanbul, Turkey
19. Third Faculty of Medicine, Charles University, Prague, Czech Republic
20. Department of Geriatrics, Neurosciences and Orthopedics, Catholic University of the Sacred Heart, Rome, Italy