Yamada, S., Takai, Y., Nemoto, K., Ogawa, Y., Kakuto, Y., Hoshi, A., & Sakamoto, K. (1992). Prognostic Factors in Radiation-Treated Esophageal Carcinoma. Acta Oncologica, 31(5), 563–567. https://doi.org/10.3109/02841869209088307