Kurishima, Koichi, Hiroaki Satoh, Shinsuke Homma, Katsunori Kagohashi, Hiroichi Ishikawa, Morio Ohtsuka, and Kiyohisa Sekizawa. 2005. “Multiple Primary Malignancies in Patients With Lung Cancer”. Radiology and Oncology 39 (1). https://www.radioloncol.com/index.php/ro/article/view/1309.