Affiliation: | 1. Division of Hematology‐Oncology and Stem Cell Transplantation, Children's Hospital, University of Helsinki and Helsinki University Hospital, Helsinki, Finland;2. Department of Pediatric Radiology, Helsinki Medical Imaging Center, University of Helsinki and Helsinki University Hospital, Helsinki, Finland;3. Division of Child Neurology, University of Helsinki and Helsinki University Hospital, Helsinki, Finland;4. Department of Pediatrics, Kuopio University Hospital, Kuopio, Finland |