1. Institute of Applied Health Sciences, University of Aberdeen, Aberdeen, UK
2. Urology Department, Nottingham University Hospitals NHS Trust, Nottingham, UK
3. Lee Kong Chian School of Medicine, Nanyang Technological University, Singapore, Singapore
4. Medical Statistics Team, Institute of Applied Health Sciences, University of Aberdeen, Aberdeen, UK
5. Department of Colorectal Surgery, Aberdeen Royal Infirmary, Aberdeen, UK
6. Department of Maxillo-Facial Surgery, Queen Alexandra Hospital, Portsmouth, UK