Oshiro, Y., Sugahara, S., Fukushima, T., Okumura, T., Nakao, T., Mizumoto, M., … Sakurai, H. (2011). Pediatric nasopharyngeal carcinoma treated with proton beam therapy. Two case reports. Acta Oncologica, 50(3), 470–473. https://doi.org/10.3109/0284186X.2010.509106