Hamada, K., Akasaka, T., Yamasaki, Y. and Ishihara, R. 2017. Advanced Oropharyngeal Cancer Can Be Easily Missed During Esophagogastroduodenoscopy. European Journal of Case Reports in Internal Medicine. 4, 4 (May 2017). DOI:https://doi.org/10.12890/2017_0005367.