Feasibility, acceptability, and preliminary effects of the Join4Joy approach for older adults living in nursing homes: a multicentre mixed-methods feasibility study - Erika Karkauskiene; Laura Coll-Planas; Andrea Fuente-Vidal; Damaso Sanchez; Nadine Barth; Dhayana Dallmeier; José Luis Socorro-Cumplido; Maria Giné-Garriga; Paolo Caserotti; Guillaume Lefebvre; Javier Jerez-Roig (European Geriatric Medicine, 2026)