Author information:
(1)Immunopathology Group, BioCruces Health Research Institute, Barakaldo, Spain.
(2)Pediatric Oncology Group, BioCruces Health Research Institute, Barakaldo, 
Spain.
(3)Pediatrics Service, Cruces University Hospital, Barakaldo, Spain.
(4)Department of Pediatrics, Faculty of Medicine and Dentistry, University of 
the Basque Country, Leioa, Spain.
(5)Immunopathology Group, BioCruces Health Research Institute, Barakaldo, Spain. 
francisco.borregorabasco@osakidetza.eus.
(6)Immunotherapy Group, Center for Transfusion and Human Tissues, Galdakao, 
Spain.
(7)Ikerbasque, Basque Foundation for Science, Bilbao, Spain.