End-of-Life Care Preferences of Older Patients with Multimorbidity: A Mixed Methods Systematic Review. - González-González AI; Schmucker C; Nothacker J; Nury E; Dinh TS; Brueckle MS; Blom JW; van den Akker M; Röttger K; Wegwarth O; Hoffmann T; Gerlach FM; et al. (Journal of clinical medicine, 2020)