OBSERVATIONAL COHORT STUDY TO CHARACTERIZE THE SAFETY OF ALLOGENEIC HEMATOPOIETIC CELL TRANSPLANTATION (HCT) FOR PATIENTS WITH CLASSICAL HODGKIN LYMPHOMA (CHL) TREATED WITH NIVOLUMABFirst published 04/04/2017 Last updated 14/03/2024 EU PAS number: EUPAS18444StudyOngoing