1. Cancer Information Service, National Cancer Center, Japan. Cancer Registry and Statistics. https://ganjoho.jp/reg_stat/statistics/dl/index.html#mortality Accessed 1 Apr 2018.
2. Japanese Gastric Cancer Association. The Japanese gastric cancer registry in 2009. http://www.jgca.jp/entry/iganhtml/doc/2009_report.pdf Accessed 1 Apr 2018.
3. Japanese Gastric Cancer Association. Japanese classification of gastric carcinoma, the 15th edition (in Japanese). Tokyo: Kanehara; 2017.
4. Brierley JD, Gospodarowicz MK, Wittekind C. TNM classification of malignant tumours, the eighth edition. Oxford: Wiley Blackwell; 2017.
5. Association Japanese Gastric Cancer. Gastric Cancer Treatment Guidelines, 5th ed. Tokyo: Kanehara; 2018 (in Japanese).