Affiliation: | 1. Department of Pediatric Oncology, Manuel de Jesus Rivera Hospital, , Managua, Nicaragua;2. Department of Pediatrics, San Gerardo Hospital, University of Milano‐Bicocca, , Fondazione MBBM, Monza, Italy;3. Department of Health Science, Center of Biostatistics, University of Milano‐Bicocca, , Milano, Italy;4. Consorzio Mario Negri Sud, Santa Maria Imbaro, , Italy;5. Oncology Institute of Southern Switzerland (IOSI), Bellinzona, , Switzerland |