1. Department of Uro-Neurology, National Hospital for Neurology and Neurosurgery, University College London Hospitals National Health Service Foundation Trust, London, United Kingdom
2. Second Department of Urology, Aristotle University of Thessaloniki, Papageorgiou Hospital, Thessaloniki, Greece
3. Department of Urology, Guys' and St. Thomas' Hospitals National Health Service Foundation Trust, London, United Kingdom