Althoff, Friederike C, Luca J Wachtendorf, Paul Rostin, Peter Santer, Maximilian S Schaefer, Xinling Xu, Stephanie D Grabitz, et al. 2021. “Effects of Night Surgery on Postoperative Mortality and Morbidity: A Multicentre Cohort Study”. BMJ Quality & Safety 30 (8): 678-88.