Erratum for

• The development and validation of a scoring tool to predict the operative duration of elective laparoscopic cholecystectomy.

  Bharamgoudar R, Sonsale A, Hodson J, Griffiths E; CholeS Study Group, West Midlands Research Collaborative. Bharamgoudar R, et al. Surg Endosc. 2018 Jul;32(7):3149-3157. doi: 10.1007/s00464-018-6030-6. Epub 2018 Jan 16. Surg Endosc. 2018. PMID: 29340820 Free PMC article.
• Utilisation of an operative difficulty grading scale for laparoscopic cholecystectomy.

  Griffiths EA, Hodson J, Vohra RS, Marriott P; CholeS Study Group; Katbeh T, Zino S, Nassar AHM; West Midlands Research Collaborative. Griffiths EA, et al. Surg Endosc. 2019 Jan;33(1):110-121. doi: 10.1007/s00464-018-6281-2. Epub 2018 Jun 28. Surg Endosc. 2019. PMID: 29956029 Free PMC article.
• Correction to: Utilisation of an operative difficulty grading scale for laparoscopic cholecystectomy.

  Griffiths EA, Hodson J, Vohra RS, Marriott P, Katbeh T, Zino S, Nassar AHM; CholeS Study Group, West Midlands Research Collaborative. Griffiths EA, et al. Surg Endosc. 2019 Jan;33(1):122-125. doi: 10.1007/s00464-018-6377-8. Surg Endosc. 2019. PMID: 30136037 Free PMC article.
• Predicting the difficult laparoscopic cholecystectomy: development and validation of a pre-operative risk score using an objective operative difficulty grading system.

  Nassar AHM, Hodson J, Ng HJ, Vohra RS, Katbeh T, Zino S, Griffiths EA; CholeS Study Group, West Midlands Research Collaborative. Nassar AHM, et al. Surg Endosc. 2020 Oct;34(10):4549-4561. doi: 10.1007/s00464-019-07244-5. Epub 2019 Nov 15. Surg Endosc. 2020. PMID: 31732855