1. Harvard Medical School; Boston Children's Hospital; Boston MA
2. Department of Urology and Pediatric Urology; University Medical Centre Groningen; Groningen the Netherlands
3. Albert Einstein College of Medicine; Montefiore Medical Center; Children's Hospital at Montefiore; Bronx NY
4. Department of Pediatrics; University of Gothenberg; Gothenberg Sweden
5. Ghent University Hospital; Ghent Belgium