temps (durée) (2) recherche (2) surveillance (2) leucémie (2) âge (2) cancer (2) Monitoring (2) Children (2) Cancer (2) Cases (2) Rates (2) Variations (2) Ci (Chinese poetry) (2) Tumors (2) Time (2) Sex (2) Research (2) Population (2) Lymphomas (2) Leukemia (2) Children (2) Cancer (2) Age (2) Cases (2) Research (2) Age (2) Cancer in children (2) Rates (2) Population (2) Quality (2)