[1] Katholieke Univ Leuven, Res Unit Pregnancy Fetus & Neonate, Dept Dev & Regenerat, Louvain, Belgium
[2] Katholieke Univ Leuven, Ctr Surg Technol, Fac Med, Louvain, Belgium
[3] Katholieke Univ Leuven Hosp, Lab Expt Urol, Dept Urol, Louvain, Belgium
[4] Katholieke Univ Leuven, Lab Skeletal Dev & Joint Disorders, Dept Dev & Regenerat, Louvain, Belgium
[5] Great Ormond St Hosp Sick Children, Dept Paediat Surg, London, England
[6] Great Ormond St Hosp Sick Children, Inst Child Hlth, London, England