DEFIBROTIDE TREATMENT IN PAEDIATRIC PATIENTS WITH SEVERE/VERY SEVERE VENO-OCCLUSIVE DISEASE/SINUSOIDAL OBSTRUCTION SYNDROME AFTER HAEMATOPOIETIC CELL TRANSPLANTATION: DEFIFRANCE INTERIM RESULTS V. Gandemer; P. Schneider; A. Sirvent; R. Martin; V. Bouvatier; M. Labopin; M. Mohty;