Brinkler R, Edwards Z, Abid S, Oliver CM, Lo Q, Stewart A Anaesthesia: 2019, 74, 1101-1111ana
Preoperative Physiotherapy for the Prevention of Respiratory Complications after Upper Abdominal Surgery: Pragmatic, Double Blinded, Multicentre Randomised Controlled Trial
Boden I, Skinner EH, Browning L et al. British Medical Journal 2017, 360:j5916 https://doi.org/10.1136/bmj.j5916