1. West London Renal and Transplant Centre, Renal Medicine, Du Cane Road, London W12 0HS, UK
2. Department of Surgery and Cancer, Imperial College London, London, UK
3. Retroperitoneal Fibrosis (RPF) Rare Disease Group, Patient Representative London, London, UK
4. Department of Urology, Imperial College Healthcare NHS Trust, London, UK
5. Imperial College London, National Heart and Lung Institute London, London, UK
6. Imperial College London, Centre for inflammatory Disease London, London, UK