1. UNIFAI, Institute of Biomedical Sciences Abel Salazar (ICBAS), University of Porto, Portugal
2. Center for Health Technology and Services Research (CINTESIS), Institute of Biomedical Sciences Abel Salazar (ICBAS), University of Porto, Portugal
3. Health Research Board, Clinical Research Facility Galway, National University of Ireland, Galway, Ireland
4. Centre for Gerontology and Rehabilitation, St Finbarrs Hospital, University College Cork, Cork City, Ireland