Vitamin Status and the Development of Postoperative Cognitive Decline in Elderly Surgical Oncologic Patients. - Weerink LBM; van Leeuwen BL; Gernaat SAM; Absalom AR; Huisman MG; van der Wal-Huisman H; Izaks GJ; de Bock GH (Annals of surgical oncology, 2018)