Surgical Endoscopy (2019) 33:122–125 and Other Interventional Techniques https://doi.org/10.1007/s00464-018-6377-8

CORRECTION

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

Ewen A. Griffiths1,2 · James Hodson3 · Ravi S. Vohra4 · Paul Marriott5,6 · Tarek Katbeh7 · Samer Zino7 · Ahmad H. M. Nassar7 · on behalf of the CholeS Study Group, West Midlands Research Collaborative

Published online: 22 August 2018 © Springer Science+Business Media, LLC, part of Springer Nature 2018

Correction to: Surgical Endoscopy Amanda J. Kirkham, Biostatistician; Cancer Research https://doi.org/10.1007/s0046​ 4-018-6281-2​ UK Clinical Trials Unit, The University of , Birmingham, UK; The author listing above corrects their affiliations in relation Sandro Pasquali, Surgical trainee, Surgical Oncology to the CholeS study group and recognises the hard work of Unit, Veneto Institute of Oncology IOV-IRCCS, Padova, our Trial Management Team, Collaborators and Data Valida- Italy; tors in contributing to this paper. Paul Marriott, Surgical trainee, West Midlands Research The list of the CholeS management group, Collaborators Collaborative, Academic Department of Surgery, The Uni- and Data Validators were omitted from the Acknowledg- versity of Birmingham, Birmingham, UK; ments. They are listed here as follows: Marianne Johnstone, Surgical trainee, West Midlands Research Collaborative, Academic Department of Surgery, CholeS Study Management Team The University of Birmingham, Birmingham, UK; Ravinder S. Vohra, Consultant Surgeon, Nottingham Philip Spreadborough, Surgical trainee, West Midlands Oesophago-Gastric Unit, Nottingham University Research Collaborative, Academic Department of Surgery, NHS Foundation Trust, Hucknall Road, Nottingham, UK; The University of Birmingham, Birmingham, UK; Derek Alderson, Emeritus Professor of Surgery, Aca- demic Department of Surgery, The University of Birming- The original article can be found online at https​://doi.org/10.1007/ ham, Birmingham, UK; s0046​4-018-6281-2. Ewen A. Griffiths, Consultant Surgeon, Department of * Ahmad H. M. Nassar Upper Gastrointestinal Surgery, University Hospitals Bir- [email protected] mingham NHS Foundation Trust, Birmingham, UK.

1 Department of Upper Gastrointestinal Surgery, University Hospitals Birmingham NHS Foundation Trust, Birmingham, CholeS Study Collaborators UK England—Stephen Fenwick, Mohamed Elmasry, Quen- tin M Nunes, David Kennedy (Aintree University 2 Institute of Cancer and Genomic Sciences, College of Medical and Dental Sciences, University of Birmingham, NHS Foundation Trust); Raja Basit Khan, Muhammad AS Birmingham, UK Khan (Airedale General Hospital); Conor J Magee, Steven 3 Institute of Translational Medicine, University Hospitals M Jones, Denise Mason, Ciny P Parappally (Wirral Univer- Birmingham NHS Foundation Trust, Birmingham, UK sity Teaching Hospital); Pawan Mathur, Michael Saunders, 4 Trent Oesophago‑Gastric Unit, Nottingham University Sara Jamel, Samer Ul Haque, Sara Zafar (Barnet and Chase Hospitals NHS Trust, Nottingham, UK Farm Hospital); Muhammad Hanif Shiwani, Nehemiah 5 West Midlands Research Collaborative, Academic Samuel, Farooq Dar, Andrew Jackson (Barnsley District Department of Surgery, Birmingham University, General Hospital); Bryony Lovett, Shiva Dindyal, Hannah Birmingham, UK Winter, Ted Fletcher, Saquib Rahman (Basildon Univesity 6 Department of Surgery, Warwick Hospital, Lakin Rd, Hospital); Kevin Wheatley, Tom Nieto, Soofiyah Ayaani Warwick, UK (Sandwell and West Birmingham Hospitals NHS Trust); 7 Department of Surgery, University Hospital Monklands, Haney Youssef, Rajwinder S Nijjar, Helen Watkin, David Lanarkshire, Scotland, UK

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Naumann, Sophie Emesih; Piyush B Sarmah, Kathryn Lee, Mohamed Heshaishi, Abdalla Eisawi, Michael Abayomi; Nikita Joji, Joel Lambert (Heart of England Foundation Wee Sing Ngu, Katie Fleming, Dalvir S Bajwa (Tees Hos- NHS Trust); Jonathan Heath, Rebecca L Teasdale, Chamin- pitals NHS Foundation Trust); Vivek Chitre, Kamal Aryal, dri Weerasinghe (Blackpool Teaching Hospitals NHS Foun- Paul Ferris (Paget University Hospitals NHS Foundation dation Trust); Paul J Needham, Hannah Welbourn, Luke Trust); Michael Silva, Simon Lammy Sarah Mohamed, Amir Forster, David Finch (Bradford Teaching Hospitals NHS Khawaja, Adnan Hussain, Mudassar A Ghazanfar, Maria Foundation Trust); Jane M Blazeby, William Robb, Angus Irene Bellini (Oxford University NHS Trust); Hamdi GK McNair, Alex Hrycaiczuk (University Hospitals Bristol Ebdewi, Mohamed Elshaer, Gianpiero Gravante, Benjamin NHS Trust); Alexandros Charalabopoulos, Sritharan Drake (Kettering General Hospital NHS Foundation Trust); Kadirkamanathan, Cheuk-Bong Tang, Naga VG Jayanthi, Arikoge Ogedegbe, Dipankar Mukherjee, Chanpreet Arhi, Nigel Noor (Broomfield Hospital); Brian Dobbins, Andrew Lola Giwa Nusrat Iqbal (Barking, Havering and Redbridge J Cockbain, April Nilsen-Nunn, Jonathan de Siqueira (Cal- University Hospitals NHS Trust); Nicholas F Watson, Smeer derdale and Huddersfield NHS Trust); Mike Pellen, Jonathan Kumar Aggarwal, Philippa Orchard, Eduardo Villatoro B Cowley, Wei-Min Ho, Victor Miu (Hull and East York- (Kings Mill Hospital); Peter D Willson, Kam Wa Jessica shire NHS Trust); Timothy J White, Kathryn A Hodgkins, Mok, Thomas Woodman, Jean Deguara (Kingston Hospital Alison Kinghorn (Chesterfield Royal Hospital NHS Founda- NHS Foundation Trust); Giuseppe Garcea, Benoy I Babu, tion Trust); Matthew G Tutton, Yahya A Al-Abed, Donald AR Dennison, Deep Malde, David Lloyd, Steve Satheesan, Menzies, Anwar Ahmad, Joanna Reed, Shabuddin Khan Omer Al-Taan, Alexander Boddy (University Hospitals of (Colchester Hospital University NHS Foundation Trust); Leicester NHS Trust); John P Slavin, Robert P Jones, Laura David Monk, Louis J Vitone, Ghulam Murtaza, Abraham Ballance, Stratos Gerakopoulos (Leighton Hospital, Mid Joel (Countess of Chester NHS Foundation Trust); Stephen Cheshire Hospitals NHS Foundation Trust); Periyathambi Brennan, David Shier, Catherine Zhang, Thusidaran Yoga- Jambulingam, Sami Mansour, Naomi Sakai, Vikas Acharya nathan (Croydon Health Services NHS Trust); Steven J Rob- (Luton & Dunstable University Hospital NHS Foundation inson, Iain JD McCallum, Michael J Jones, Mohammed Trust); Mohammed M Sadat, Lawen Karim, David Larkin, Elsayed, Liz Tuck, John Wayman, Kate Carney (North Cum- Khalid Amin (Macclesfield District General Hospital); Ama- bria University Hospitals Trust); Somaiah Aroori, Kenneth rah Khan, Jennifer Law, Saurabh Jamdar, Stella R Smith, B Hosie, Adam Kimble, David M Bunting, Kenneth B Hosie Keerthika Sampat, Kathryn M O’shea (Central Manchester (Plymouth Hospitals NHS Trust); Adeshina S Fawole, NHS Foundation Trust); Mangta Manu, Fotini M Asprou, Mohammed Basheer, Rajiv V Dave, Janahan Sarveswaran, Nabeela S Malik, Jessica Chang, Marianne Johnstone (Royal Elinor Jones, Chris Kendal (Mid Yorkshire NHS Trust); Wolverhampton Hospitals NHS Trust); Michael Lewis, Michael P Tilston, Martin Gough, Tom Wallace, Shailendra Geoffrey P Roberts, Babu Karavadra, Evangelos Photi (Nor- Singh, Justine Downing Katherine A Mockford, Eyad Issa, folk and Norwich University Hospitals NHS Foundation Nayab Shah, Neal Chauhan (Northern Lincolnshire and Trust); James Hewes, Laura Gould, Alice Chambers, Dan Goole NHS Foundation Trust); Timothy R Wilson, Amir Rodriguez (North Bristol NHS Trust); Derek A O’Reilly, Forouzanfar, Jonathan RL Wild, Emma Nofal, Catherine Anthony J Rate, Hema Sekhar, Lucy T Henderson, Benjamin Bunnell, Khaliel Madbak (Doncaster and Bassetlaw Hospi- Z Starmer, Peter O Coe, Sotonye Tolofari, Jenifer Barrie tals NHS Foundation Trust); Sudhindra TV Rao, Laurence (Pennine Acute NHS Trust); Gareth Bashir, Jake Sloane, Devoto, Najaf Siddiqi, Zechan Khawaja (Dorset County Suroosh Madanipour, Constantine Halkias, Alexander EJ Hospital NHS Foundation Trust); James C Hewes, Laura Trevatt (North Middlesex Trust); David W Borowski, Jane Gould, Alice Chambers, Daniel Urriza Rodriguez (North Hornsby, Michael J Courtney, Suvi Virupaksha (North Tees Bristol NHS Trust); Gourab Sen, Stuart Robinson, Kate Car- and Hartlepool NHS Foundation Trust); Keith Seymour, ney, Francis Bartlett (Freeman Hospital); David M Rae, Sarah Robinson, Helen Hawkins, Sadiq Bawa, Paul V Gal- Thomas EJ Stevenson, Kas Sarvananthan (Frimley Park lagher, Alistair Reid, Peter Wood (Northumbria Healthcare Hospital NHS Trust); Simon J Dwerryhouse, Simon M NHS Foundation Trust); JG Finch, J Guy Finch, J Parmar, E Higgs, Oliver J Old, Thomas J Hardy, Reena Shah Steve T Stirland (Northampton General Hospital NHS Trust); James Hornby, Ken Keogh, Lucinda Frank (Gloucestershire Hos- Gardner-Thorpe, Ahmed Al-Muhktar, Mark Peterson, Ali pitals NHS Trust); Musallam Al-Akash, Emma A Upchurch Majeed (Sheffield Teaching Hospitals NHS Foundation (Great Western Hospitals NHS Foundation Trust); Richard Trust); Farrukh M Bajwa, Jack Martin, Alfred Choy, Andrew J Frame, Michael Hughes, Clare Jelley (Harrogate and Dis- Tsang (Peterborough City Hospital); Naresh Pore, David R trict NHS Foundation Trust); Simon Weaver, Sudipta Roy, Andrew, Waleed Al-Khyatt, Christopher Taylor Santosh Toritseju O Sillo, Giorgios Galanopoulos (Wye Valley NHS Bhandari, Adam Chambers, Dhivya Subramanium (United Trust); Tamzin Cuming, Pedro Cunha, Salim Tayeh, Saran- Lincolnshire Hospitals NHS Trust); Simon K C Toh, Nicho- tos Kaptanis (Homerton University Hospital NHS Trust); las C Carter, Sophie Tate, Belinda Pearce, Denise

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Wainwright, Stuart J Mercer, Benjamin Knight (Portsmouth Hospital, ); Mohammad A Khan, Matthew Pop- Hospitals NHS Trust); Vardhini Vijay, Swethan Alagarat- plewell, Dimitrios Kyriakidis, Anwar Hussain (Mid Staf- nam, Sidhartha Sinha, Shahab Khan (The Princess Alexan- fordshire NHS Foundation Trust); Natasha Henley, Jessica dra Hospital NHS Trust); Shamsi S El-Hasani, Abdulzahra R Packer, Laura Derbyshire, Jonathan Porter (Stockport A Hussain (Kings College Hospital NHS Foundation Trust); NHS Foundation Trust); Shaun Appleton, Marwan Farouk, Vish Bhattacharya, Nisheeth Kansal, Tani Fasih, Claire Melvinder Basra (Bucks Healthcare NHS Trust); Neil A Jen- Jackson (Gateshead Health NHS Foundation Trust); Midhat nings, Shahda Ali, Venkatesh Kanakala (City Hospitals Sun- N Siddiqui, Imran A Chishti, Imogen J Fordham, Zohaib derland NHS Foundation Trust); Haythem Ali, Risha Lane, Siddiqui (Lewisham and Greenwich NHS Trust); Harald Richard Dickson-Lowe, Prizzi Zarsadias (Tunbridge Wells Bausbacher, Ileana Geogloma, Kabita Gurung (Queen Eliza- and Maidstone NHS Trust); Darius Mirza, Sonia Puig, beth Hospital NHS Trust); George Tsavellas, Pradeep Khalid Al Amari, Deepak Vijayan, Robert Sutcliffe, Ravi Basynat, Ashish Kiran Shrestha, Sanjoy Basu, Alok Chhabra Marudanayagam (University Hospital Birmingham NHS Mohan Harilingam, Mohamed Rabie, Mansoor Akhtar (East Foundation Trust); Zayed Hamady, Abheesh R Prasad, Kent Hospitals University NHS Foundation Trust); Pradeep Abhilasha Patel (University Hospital andWarwick- Kumar, Sadaf F Jafferbhoy, Najam Hussain, Soulat Raza shire NHS Trust); Damien Durkin,Parminder Kaur, Laura (Burton Hospitals NHS Foundation Trust); Manzarul Haque, Bowen (University Hospital of North Staffordshire NHS Imran Alam, Rabiya Aseem, Shakira Patel, Mehek Asad Trust); James P Byrne, Katherine L Pearson, Theo G Del- (Royal Albert Edward Infirmary, Wigan Wrightington and isle, James Davies (University Hospital Southampton NHS Leigh NHS Trust); Michael I Booth, William R Ball, Chris- Foundation Trust); Mark A Tomlinson, Michelle A John- topher PJ Wood, Ana C Pinho-Gomes (Royal Berkshire NHS pulle, Corinna Slawinski (University Hospitals of More- Foundation Trust); Ambareen Kausar, Moh’d Rami Obeidal- cambe Bay); Andrew Macdonald, James Nicholson, Katy lah (East Lancashire Hospital Trust); Joseph Varghase, Newton, James Mbuvi (University Hospital South Manches- Joshil Lodhia, Donal Bradley, Carla Rengifo, David Lindsay ter NHS Foundation Trust); Ansar Farooq, Bhavani Sidhar- (Royal Bolton Hospital NHS Foundation Trust); Sivakumar tha Mothe, Zakhi Zafrani, Daniel Brett (Warrington and Gopalswamy, Ian Finlay, Stacy Wardle, Naomi Bullen Halton Hospitals NHS Trust); James Francombe, Philip (Royal Cornwall NHS Trust); Syed Yusuf Iftikhar, Altaf Spreadborough, James Barnes, Melanie Cheung (South War- Awan, Javed Ahmed, Paul Leeder (Royal Derby NHS Foun- wickshire NHS Foundation Trust); Ahmed Z Al-Bahrani, dation Trust); Guiseppe Fusai, Giles Bond-Smith, Alicja Giuseppe Preziosi, Tomas Urbonas (Watford General Hos- Psica, Yogesh Puri (Royal Free, London); David Hou, Fer- pital); Justin Alberts, Mekhlola Mallik, Krashna Patel, Ash- gus Noble, Karoly Szentpali, Jack Broadhurst (Hampshire vina Segaran, Triantafyllos Doulias (West Suffolk NHS Hospital NHS Foundation Trust); Ravindra Date, Martin R Trust); Pratik A Sufi, Caroline Yao, Sarah Pollock (Whit- Hossack, Yan Li Goh, Paul Turner, Vinutha Shetty (Lanca- tington NHS Trust); Antonio Manzelli, Saj Wajed, Michail shire Teaching Hospitals NHS Foundation Trust); Manel Kourkulos, Roberto Pezzuto (Wonford Hospital); Martin Riera, Christina A W Macano, Anisha Sukha (Royal Shrews- Wadley, Emma Hamilton, Shameen Jaunoo, Robert Padwick bury Hospital); Shaun R Preston, Jennifer R Hoban, Daniel (Worcestershire Acute Hospitals NHS Trust); Mazin Sayegh, J Puntis, Sophie V Williams (Royal Surrey County Hospital Richard C Newton, Madhusoodhana Hebbar, Sameh F NHS Foundation Trust); Richard Krysztopik, James Kynas- Farag, (Western Sussex Hospitals NHS Foundation Trust); ton, Jeremy Batt, Matthew Doe (Royal United Hospital Bath John Spearman, Mohammed F Hamdan, Conrad D’Costa, NHS Trust); Andrzej Goscimski, Gareth H Jones, Stella R Christine Blane; (Yeovil District Hospital NHS Trust); Smith, Claire Hall (Salford Royal NHS Foundation Trust); Mathew Giles, Mark B Peter, Natalie A Hirst, Tanvir Hos- Nick Carty, Jamil Ahmed, Sofoklis Panteleimonitis (Salis- sain, Arslan Pannu Yesar El-Dhuwaib, Tamsin E M Morri- bury Hospital Foundation Trust); Rohan T Gunasekera, son, Greg W Taylor (York Teaching Hospital NHS Founda- Andrea RG Sheel, Hannah Lennon, Caroline Hindley tion Trust). (Southport and Ormskirk Hospital NHS Trust); Marcus Northern Ireland—Ronald LE Thompson, Ken Reddy, Ross Kenny, Natalie Elkheir, Emma R McGlone (St McCune, Paula Loughlin, Roger Lawther (Altnagelvin George’s Healthcare NHS Trust); Rajasundaram Rajagane- Area Hospital); Colman K Byrnes, Duncan J Simpson, Abi shan, Kate Hancorn, Anita Hargreaves (St Helens and Mawhinney, Conor Warren (Antrim Area Hospital); Damian Knowsley Teaching Hospitals NHS Trust); Raj Prasad, McKay, Colin McIlmunn, Serena Martin, Matthew MacArt- David A Longbotham, Dhakshinamoorthy Vijayanand, ney (Daisy Hill Hospital); Tom Diamond, Phil Davey, Claire Imeshi Wijetunga (Leeds Teaching Hospitals); Paul Ziprin, Jones, Joshua M Clements, Ruairi Digney, Wei Ming Chan, Christopher R Nicolay, Geoffrey Yeldham, Edward Read Stephen McCain, Sadaf Gull, Adam Janeczko, Emmet Dor- (Imperial College Healthcare NHS Trust); James A Gossage, rian, Andrew Harris, Suzanne Dawson, Dorothy Johnston, Rachel C Rolph, Husam Ebied, Manraj Phull (St Thomas’ Barry McAree, (Belfast City Hospital, Mater Infirmorum

1 3 Surgical Endoscopy (2019) 33:122–125 125

Hospital Belfast and Royal Victoria Hospital); Essam Gha- Hospital); Stuart Suttie, Rowena Belding, Andrew McClarey reeb, George Thomas, Martin Connelly, Stephen McKen- (); Alan T Boyd, Graeme JK Guthrie, Pei zie, Krzysztos Cieplucha (South West Acute Hospital); Gary J Lim, Andreas Luhmann (); Angus Spence, William Campbell, Gareth Hooks, Neil Bradley JM Watson, Colin H Richards, Laura Nicol, Marta Madurska (Ulster Hospital). (Raigmore Hospital); Ewen Harrison, Kathryn M Boyce, Republic of Ireland—Arnold DK Hill, John T Cassidy, Amanda Roebuck, Graeme Ferguson (Royal Infirmary of Michael Boland (Beaumont Hospital, Dublin); Paul Burke, Edinburgh); Pradeep Pati, Michael S J Wilson, Faith Dal- Deirdre M Nally (University Hospital Limerick); Arnold gaty, Laura Fothergill ( Hospital); Peter J Driscoll, DK Hill, Elmoataz Khogali, Wael Shabo, Edrin Iskandar Kirsty L Mozolowski, Victoria Banwell, Stephen P Bennett (Louth County Hospital and Our Lady of Lourdes Hospital); (Victoria Hospital, Kirkcaldy); Paul N Rogers, Brendan L Gerry P McEntee, Maeve A O’Neill, Colin Peirce, Emma Skelly, Claire L Rutherford, Ahmed K Mirza (Western Infir- M Lyons (Mater Hospital, Dublin); Adrian W O’Sullivan, mary Glasgow). Rohan Thakkar, Paul Carroll, Ivan Ivanovski (Mercy Univer- Wales—Taha Lazim, Henry C C Lim, Diana Duke, Talat sity Hospital); Paul Balfe, Matthew Lee (St Luke’s General Ahmed (Bronglais General Hospital); William D Beasley, Hospital Kilkenny);, Des C Winter, Michael E Kelly, Emir Marc D Wilkinson, Geta Maharaj, Cathy Malcolm (Glang- Hoti, Donal Maguire; Priyadarssini Karunakaran, Justin G wili General and Prince Philip Hospital); Timothy H Brown, Geoghegan, Frank McDermott, Sean T Martin (St Vincent’s Bilal Al-Sarireh, Guy M Shingler, Nicholas Mowbray, Rami University and Private Hospitals, Dublin); Keith S Cross, Radwan (Morriston and Singleton Hospitals); Paul Morcous, Fiachra Cooke, Saquib Zeeshan, James O Murphy (Water- Simon Wood, Abbas Kadhim (Princess of Wales Hospital); ford Regional Hospital); Ken Mealy, Helen M Mohan, Duncan J Stewart, Andrew L Baker, Nicola Tanner, Hrishi- Yuwaraja Nedujchelyn, Muhammad Fahad Ullah (Wexford kesh Shenoy (Wrexham Maelor Hospital). General Hospital). Data validators—Shazia Hafiz, Joshua A. De Marchi, Scotland—Irfan Ahmed, Francesco Giovinazzo, James Deepak Singh-Ranger, Elzanati Hisham, Paul Ainley, Ste- Milburn (Aberdeen Royal Infirmary); Sarah Prince, Elea- phen O’Neill. John Terrace, Sara Napetti, Benjamin Hop- nor Brooke, Joanna Buchan (Belford Hospital); Ahmed M wood, Thomas Rhys, Justine Downing, Osama Kanavati, Khalil, Elizabeth M Vaughan, Michael I Ramage, Roland C Maria Coats, Danail Aleksandrov, Charlotte Kallaway, Aldridge (Borders General Hospital); Simon Gibson, Gary A Salama Yahya, Beatrix Weber, Alexa Templeton, Martin Nicholson, David G Vass (Crosshouse Hospital, Ayrshire & Trotter, Christina Lo, Ajit Dhillon, Nick Heywood, Yousif Arran); Alan J Grant, David J Holroyd, M Angharad Jones, Aawsaj, Alhafidz Hamdan, Obuobi Reece-Bolton, Andrew Cherith MLR Sutton (Dr Gray’s Hospital); Patrick O’Dwyer, McGuigan, Yousef Shahin, Aymon, Ali Alison Luther, Frida Nilsson (Gartnavel General Hospital); Beatrix Weber, James A Nicholson, Ilayaraja Rajendran, Matthew Boal, Tracey K Williamson, Kushik Lalla, Alice Bryant (Gilbert Judith Ritchie. Bain Hospital); C Ross Carter, Craig R Forrest, David I Hunter (Glasgow Royal Infirmary); Ahmad H Nassar, Mavis N Orizu, Katrina Knight, Haitham Qandeel (Monklands

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