[1] Sacynzki, J.S. The New England Journal of Medicine, 2012
[2] Myrick C. et al., JAMA Surgery, 2019. Watt et al. 2018;
[3] Birkelbach et al., BMC anesthesiology, 2019.
[4] Leung, J. et al Anesthesia and Analgesia, 2011
[5] Kim, S. et al., JAMA Surgery, 2014
[6] Rana, M. et al., Anesthesiology Clinics, 2017
[7] Santos-Eggimann, B. et al., The Journals of Gerontology. Series A, Biological Sciences and Medical Sciences 2009
[8] Moyce, Z. et al Anaesthesia 2014; Sepheri et al The Journal of Thoracic and Cardiovascular Surgery 2014.