Yi, Kow Ren, and Goh Kian Liang. “Metachronous Osteosarcoma: A Rare Case Report”. IIUM Medical Journal Malaysia 18, no. 3 (January 15, 2020). Accessed January 24, 2022. https://journals.iium.edu.my/kom/index.php/imjm/article/view/655.