Correction to: Utilisation of an operative difficulty grading scale for laparoscopic cholecystectomy

Ewen A. Griffiths, James Hodson, Ravi Vohra, Paul Marriott, Tarek Katbeh, Samer Zino, Ahmad H. M. Nassar, Ravinder Vohra, Amanda Kirkham, Sandro Pasquali, Marianne Johnstone, Philip Spreadborough, Derek Alderson, Stephen W. Fenwick, Mohamed Elmasry, Quentin Nunes, David Kennedy, Raja B. Khan, Muhammad Aamir Khan, Conor Magee, Steven M. Jones, Denise Mason, Ciny P. Parappally, Pawan Mathur, Michael Saunders, Sara Jamel, Samer Ul Haque, Sara Zafar, Muhammad Hanif Shiwani, Nehemiah Samuel, Farooq Ahmad Dar, A. Jackson, Bryony Lovett, Shiva Dindyal, Hannah Winter, Ted Fletcher, Saquib Rahman, Kevin Wheatley, Tom Nieto, Soofiyah Ayaani, Haney Youssef, Rajwinder Nijjar, Helen Watkin, David N Naumann, Sophie Emesih, Piyush Sarmah, Kathryn Lee, Nikita Joji, Joel Lambert, Jonathan Heath, Rebecca L. Teasdale, C Weerasinghe, Paul J. 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