Hamada, Kenta, Tomofumi Akasaka, Yasushi Yamasaki, and Ryu Ishihara. “Advanced Oropharyngeal Cancer Can Be Easily Missed During Esophagogastroduodenoscopy”. European Journal of Case Reports in Internal Medicine 4, no. 4 (May 26, 2017). Accessed April 28, 2024. https://www.ejcrim.com/index.php/EJCRIM/article/view/597.