Design and rationale of a routine clinical care pathway and prospective cohort study in older patients needing intensive treatment. - van Holstein Y; van Deudekom FJ; Trompet S; Postmus I; Uit den Boogaard A; van der Elst MJT; de Glas NA; van Heemst D; Labots G; Altena M; Slingerland M; Liefers GJ; et al. (BMC geriatrics, 2021)