Correction: Developing a research agenda on NATure‑based and Animal‑assisted Intervention Strategies (NATAIS) in people with neurodegenerative diseases with a specific focus on social isolation and loneliness: a group concept mapping procedure - I. J. N. Declercq; R. Leontjevas; M. ‑J. Enders‑Slegers; M. Molog; D. L. Gerritsen; K. Hediger (BMC Geriatrics)