Li XF, Jiang D, Jiang YL,Yu H, Zhang MQ, Jiang JL, He LL, Yu H. Comparison of low and high inspiratoryoxygen fraction added to lung-protective ventilation on postoperative pulmonarycomplications after abdominal surgery: A randomized controlled trial. J Clin Anesth. 2020Dec;67:110009.Cohen B, Ruetzler K, Kurz A, Leung S, Rivas E, Ezell J, Mao G, Sessler DI, Turan A.Intra-operative high inspired oxygen fraction does not increase the risk ofpostoperative respiratory complications: Alternating intervention clinicaltrial. Eur J Anaesthesiol. 2019 May;36(5):320-326.