Hamdan, A 2018, ' The development and validation of a scoring tool to predict the operative duration of elective laparoscopic cholecystectomy ', Surgical Endoscopy, vol. 32, no. 7, pp. 3149-3157 . https://doi.org/10.1007/s00464-018-6030-6 Surgical Endoscopy Bharamgoudar, R, Sonsale, A, Hodson, J, Griffiths, E, Vohra, R S, Kirkham, A J, Pasquali, S, Marriott, P, Johnstone, M, Spreadborough, P, Alderson, D, Griffiths, E A, Fenwick, S, Elmasry, M, Nunes, Q M, Kennedy, D, Khan, R B, Khan, M A S, Magee, C J, Jones, S M, Mason, D, Parappally, C P, Mathur, P, Saunders, M, Jamel, S, Haque, S U, Zafar, S, Shiwani, M H, Samuel, N, Dar, F, Heath, J, Blazeby, J M, McNair, A G K, Reed, J, Khan, S, Robinson, S J, Dwerryhouse, S J, Higgs, S M, Old, O J, Frank, L, Jones, R P, Roberts, G P, Chambers, A, Reid, A, Gardner-Thorpe, J, Martin, J, Chambers, A, Knight, B, Krysztopik, R, Kynaston, J 2018, ' The development and validation of a scoring tool to predict the operative duration of elective laparoscopic cholecystectomy ', Surgical Endoscopy, vol. 32, no. 7, pp. 1-9 . https://doi.org/10.1007/s00464-018-6030-6