Yamada, Shogo, Yoshihiro Takai, Kenji Nemoto, Yoshihiro Ogawa, Yoshihisa Kakuto, Akihiko Hoshi, and Kiyohiko Sakamoto. “Prognostic Factors in Radiation-Treated Esophageal Carcinoma”. Acta Oncologica 31, no. 5 (January 1, 1992): 563–567. Accessed May 22, 2026. https://medicaljournalssweden.se/actaoncologica/article/view/32256.