1University Medical Center Utrecht, Utrecht, Netherlands,2Eurocord International Registry, Paris,3La Timone, Marseille, France,4King Faisal Specialist Hospital & Research Center, Riyadh, Saudi Arabia,5Randwick Sydney Children's Hospital, Sydney, Australia,6St.Laszlo Hospital, Budapest, Hungary,7Ghent University Hospital, Ghent,8UZ Brussel, Brussels, Belgium,9Monza Ospedale San Gerardo Clinica Pediatrica, Monza, Italy,10Hospital Vall D'Hebron, Barcelona,11Hospital Universitario Vergen de la Arrixaca, Murcia, Spain,12The Children's Hosp. at Westmead, Sydney, Australia,13University Hospital Gasthuisberg, Leuven, Belgium,14Hannover Medical School Children's Hospital, Hannover, Germany,15Hadassah Hebrew University Medical Center, Jerusalem,16Rambam Medical Center, Haifa, Israel,17Instituto Portugues de Oncologia, Lisboa, Portugal,18Leiden University Medical Center, Leiden, Netherlands,19Akdeniz University Medical School, Antalya, Turkey,20Niño Jesus Children's Hospital, Madrid, Spain,21Newcastle University, Newcastle, United Kingdom