Maintenance work on the ZORA databases is scheduled for Wednesday 22 May 2019 from 20:00-22:00. During this period ZORA and JDB will not be available. Thank you for your understanding.
van Klei, W A; Hoff, R G; van Aarnhem, E E; Simmermacher, R K; Regli, L; Kappen, T H; van Wolfswinkel, L; Kalkman, C J; Buhre, W E; Peelen, L M (2012). Effects of the introduction of the WHO "Surgical Safety Checklist" on in-hospital mortality: a cohort study. Annals of Surgery, 255(1):44-49.