1. Barts and The London NHS Trust; Department of Urology; West Smithfield London UK EC1A 7BE
2. University of Nottingham; Division of Child Health, Obstetrics & Gynaecology (COG), School of Medicine; 1701 E Floor East Block Queens Medical Centre Nottingham NG7 2UH UK
3. London North West University Healthcare NHS Trust; Haematology and Sickle Cell Centre; Central Middlesex Hospital Acton Lane London UK NW10 7NS