1. Argentinian Oncopediatric Registry; National Cancer Institute; Ministry of Health; Buenos Aires Argentina
2. Garrahan Pediatric Hospital; Buenos Aires Argentina
3. Victor Vilela Children's Hospital; Rosario Argentina
4. Italian Hospital; Buenos Aires Argentina
5. Alejandro Posadas National Hospital; Morón Argentina
6. Humberto Notti Children's Hospital; Mendoza Argentina
7. Ricardo Gutiérrez Children's Hospital; Buenos Aires Argentina
8. Austral University Hospital; Pilar Argentina