1. St. Mary’s Hospital, Imperial College Healthcare NHS Trust London , London , UK
2. General Surgery, The Grange University Hospital, Aneurin Bevan University Health Board, NHS , Cwmbran, Wales , UK
3. Queen Elizabeth Hospital, University Hospitals Birmingham NHS Trust , Birmingham , UK
4. Heartlands Hospital, University Hospitals Birmingham NHS Trust , Birmingham , UK
5. Royal Gwent Hospital, Aneurin Bevan University Health Board, NHS , Newport, Wales UK