1. Faculty of Medicine, King Abdulaziz University, Jeddah 21589, Saudi Arabia
2. The London Breast Institute, Princess Grace Hospital, London W1U 5NY, UK
3. Department of Surgery, Khyber Teaching Hospital, Peshawar 25120, Pakistan
4. College of Medicine and Health, University of Exeter Medical School, Exeter EX1 2LU, UK
5. Department of General Surgery, University College London Hospital, Euston Road, London NW1 2BU, UK
6. Department of General Surgery, Royal Free Hospital, London NW3 2QG, UK