1 Department of Geriatrics, Universitair ziekenhuis Brussel, Vrije Universiteit Brussel, Brussels, Belgium; Faculty of Medicine, Vrije Universiteit Brussel, Brussels, Belgium.
2 Physical Medicine and Rehabilitation Department, Hospital Del Mar - Hospital de L'Esperança, Parc de Salut Mar, Barcelona, Catalonia, Spain; Rehabilitation Research Group, Institut Hospital del Mar d'Investigacions Mèdiques (IMIM), Barcelona, Catalonia, Spain; School of Medicine, Universitat Internacional de Catalunya, Sant Cugat del Vallès, Barcelona, Catalonia, Spain.
3 Geriatrics Department, Brugmann University Hospital, Université Libre de Bruxelles, Brussels, Belgium.
4 Department of Geriatric Medicine and Memory Clinic, Research Center on Autonomy and Longevity, University Hospital, Angers, France.
5 Department of Geriatric Medicine and Memory Clinic, Research Center on Autonomy and Longevity, University Hospital, Angers, France; University of Angers, UPRES EA 4638, Angers, France; Gérontopôle Autonomie Longévité des Pays de la Loire, F-44000 Nantes, France; Robarts Research Institute, Department of Medical Biophysics, Schulich School of Medicine and Dentistry, The University of Western Ontario, London, ON N6A 5K8, Canada.
6 Rehabilitation Research Group, Institut Hospital del Mar d'Investigacions Mèdiques (IMIM), Barcelona, Catalonia, Spain; Geriatrics Department, Brugmann University Hospital, Université Libre de Bruxelles, Brussels, Belgium; Geriatrics Department, Hospital Del Mar - Hospital de L'Esperança - Centre Fòrum, Parc de Salut Mar, Barcelona, Catalonia, Spain; WHO Collaborating Centre for Public Health Aspects of Musculo-Skeletal Health and Ageing, Division of Public Health, Epidemiology and Health Economics, University of Liège, Liège, Belgium. Electronic address: dolo.sanchezr@gmail.com.