1. Centre for Health Performance and Wellbeing, Anglia Ruskin University , Cambridge , UK
2. Division of Preventive Medicine and Public Health, Department of Public Health Sciences, School of Medicine, University of Murcia , Murcia , Spain
3. Department of Geriatric Medicine, Faculty of Medicine, Bezmialem Vakif University , Istanbul , Turkey
4. School of Medicine, Ulster University , Londonderry, Northern Ireland , UK
5. Research and Development Unit, Parc Sanitari Sant Joan de Déu , Sant Boi de Llobregat, Barcelona , Spain