Benefits of specialist palliative care by identifying active ingredients of service composition, structure, and delivery model: A systematic review with meta-analysis and meta-regression. - Johnson, Miriam J.; Rutterford, Leah; Sunny, Anisha; Pask, Sophie; de Wolf-Linder, Susanne; Murtagh, Fliss E. M.; Ramsenthaler, Christina (PLoS Medicine, 2024)