Weiser T., Regenbogen S., Thompson K., et al. An estimation of the global volume of surgery: a modelling strategy based on available data. The Lancet Global Health. 2008; 372: 139–44.

Mihaolain A., Butler J., Wood A., et al. The increased need for liaison psychiatry in surgical patients due to the high prevalence of undiagnosed anxiety and depression. Irish Journal of Medicine Science. 2008; 177(3): 211–5.

Kudoh A., Katagai H., Takazawa T. Antidepressant treatment for chronic depressed patients should not be discontinued prior to anesthesia. Canadian Journal of Anesthesia. 2002; 49: 132–6.

Practice ACoO ACOG Committee Opinion No. 474: nonobstetric surgery during pregnancy. Obstet Gynecol. 2011; 117: 420–421.

Pearl J., Price R., Richardson W., Fanelli R. Society of American Gastrointestinal Endoscopic S (2011) Guidelines for diagnosis, treatment, and use of laparoscopy for surgical problems during pregnancy. Surg Endosc. 25: 3479–3492.

de Bari O., Wang TY., Liu M., Paik CN., Portincasa P., Wang DQ. Cholesterol cholelithiasis in pregnant women: pathogenesis, prevention and treatment. Ann Hepatol. 2014; 13(6): 728–45.