1. Institute of Cellular Medicine, Newcastle University, Newcastle, UK
2. Health Services Research Unit, University of Aberdeen, Aberdeen, UK
3. Health Economics Research Unit, University of Aberdeen, Aberdeen, UK
4. Academic Urology Unit, University of Aberdeen, Aberdeen, UK
5. School of Medicine, University of St Andrews, St Andrews, UK
6. St George’s Healthcare NHS Trust, London, UK
7. Norfolk and Norwich University Hospitals NHS Foundation Trust, Norwich, UK
8. Stone Patient Advisory Group, Section of Endourology, British Association of Urological Surgeons, London, UK
9. Aberdeen Royal Infirmary, Foresterhill, Aberdeen, UK