1 Liverpool Clinical and Cancer Research UK Trials Unit, University of Liverpool, Liverpool L69 3GL, UK.
2 Liverpool Clinical and Cancer Research UK Trials Unit, University of Liverpool, Liverpool L69 3GL, UK; Royal Liverpool University Hospital, Liverpool, UK. Electronic address: [email protected].
3 Liverpool Clinical and Cancer Research UK Trials Unit, University of Liverpool, Liverpool L69 3GL, UK; Clatterbridge Cancer Centre, Wirral, UK.
4 Liverpool Clinical and Cancer Research UK Trials Unit, University of Liverpool, Liverpool L69 3GL, UK; Royal Liverpool University Hospital, Liverpool, UK.
5 Department of General, Abdominal and Transplant Surgery, University of Heidelberg, Heidelberg, Germany.