1 Department of Surgery, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Queen Mary Hospital, Hong Kong. Electronic address: paultam@hku.hk.
2 Department of Paediatric Surgery, King's College Hospital, London, UK.
3 Department of Surgery, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Queen Mary Hospital, Hong Kong.
4 Division of Paediatric Surgery, University of Cape Town, Red Cross War Memorial Children's Hospital, Cape Town, South Africa.
5 Department of Urology, Ghent University Hospital, University of Ghent, Ghent, Belgium.
6 Department of Urology, Boston Children's Hospital, Harvard Medical School, Boston, USA.