OKADA ATSUSHI, HATORI MASAHITO, HOSAKA MASAMI, WATANUKI MUNENORI, and ITOI EIJI. 2009. “Secondary Osteosarcoma Arising After Treatment for Childhood Hematologic Malignancies”. Upsala Journal of Medical Sciences 114 (4):249–255. https://doi.org/10.3109/03009730903177340.