Social isolation and loneliness of the elderly during COVID-19. Portuguese Journal of Family Medicine and General Practice, [S. l.], v. 38, n. 5, p. 539–44, 2022. DOI: 10.32385/rpmgf.v38i5.13347. Disponível em: https://rpmgf.pt/ojs/index.php/rpmgf/article/view/13347. Acesso em: 18 apr. 2026.