1. Newcastle upon Tyne Hospitals NHS Foundation Trust, Newcastle upon Tyne, UK
2. Department of Health Sciences, University of Leicester, Leicester, UK
3. Newcastle Clinical Trials Unit, Newcastle University, Newcastle upon Tyne, UK
4. Institute of Health & Society, Newcastle University, Newcastle upon Tyne, UK
5. Reproductive Sciences Section, Department of Cancer Studies & Molecular Medicine, University of Leicester, Leicester, UK
6. Department of Urology, Morriston Hospital, Swansea, UK
7. School of Medicine, National University of Ireland, Galway, Ireland
8. Department of Urology, Royal Hallamshire Hospital, Sheffield, UK