1. Beckingham I & Gallstone Commissioning Guidelines Group. Commissioning guide: Gallstone disease. Sponsoring Organisation: Association of Upper gastrointestinal Surgeons. 2016. Available from: https://www.augis.org/augis-guidelines/. [Accessed 22nd May 2019]
2. Aerts R., Penninckx F. The burden of gallstone disease in Europe. Aliment Pharmacol Ther 2003;18(s3):49–53. https://doi.org/10.1046/j.0953-0673.2003.01721.x.
3. NICE. Overview, NG45 Routine preoperative tests for elective surgery | Guidance | NICE NG45 . 2016, Available from: https://www.nice.org.uk/guidance/ng45/resources/routine-preoperative-tests-for-elective-surgery-pdf-1837454508997 [Accessed 22nd May 2019]
4. Talpur K, Malik AM, Sangrasi AK, Laghari AA, Qureshi JN SC. Post laparoscopic cholecystectomy exploration: An audit | Talpur | Pakistan Journal of Medical Sciences Old Website. Pakistan J Med Sci 2012;28(3):481–3.
5. Comitalo JB. Laparoscopic cholecystectomy and newer techniques of gallbladder removal. JSLS J Soc Laparoendosc Surg 2012;16(3):406–12. https://doi.org/10.4293/108680812X13427982377184.