Maintenance work on the ZORA database servers is scheduled for Thursday 25th July 2019 from 19:00-20:00. During this period ZORA and JDB will not be available. Thank you for your understanding.
Vonlanthen, René; Lodge, Peter; Barkun, Jeffrey S; et al; Käser, S A; Petrowsky, Henrik; Clavien, Pierre-Alain (2018). Toward a Consensus on Centralization in Surgery. Annals of Surgery, 268(5):712-724.