1 Bristol Randomised Trials Collaboration, Population Health Sciences, Bristol Medical School, University of Bristol, Bristol.
2 Population Health Sciences, Bristol Medical School, University of Bristol, Bristol.
3 Tyntesfield Medical Group, Brockway Medical Centre a member of NHS Bristol, North Somerset and South Gloucestershire Clinical Commissioning Group, Bristol.
4 Public and patient involvement representative.
5 Translational Health Sciences, Bristol Medical School, University of Bristol; Bristol Urological Institute, North Bristol NHS Trust, Bristol.