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Matsuda A, Matsuda T, Shibata A, et al. Cancer incidence and incidence rates in Japan in 2008: A study of 25 population-based cancer registries for the Monitoring of Cancer Incidence in Japan (MCIJ) project. Jpn J Clin Oncol 44: 388-396, 2013.","DOI":"10.1093\/jjco\/hyu003"},{"key":"2","unstructured":"2. Haruma K, Kato M, Inoue K, et al. Ien no Kyoto bunrui. 1st ed. Nihon medical center, Tokyo, 2014: 99-110 (in Japanese)."},{"key":"3","unstructured":"3. Kamata T, Tanaka A, Sugiu K, et al. Nodular gastritis and gastric cancer. I to Cho (Stomach and Intestine) 42: 946-952, 2007 (in Japanese, Abstract in English)."},{"key":"4","unstructured":"4. Shinomura Y. <i>Helicobacter pylori<\/i> and gastric cancer: Enlarged fold gastritis is a risk factor for gastric cancer. I to Cho (Stomach and Intestine) 42: 953-965, 2007 (in Japanese, Abstract in English)."},{"key":"5","unstructured":"5. Nakamura K. Gastric cancer triangle: Pathological way of thinking on gastric cancer diagnosis. I to Cho (Stomach and Intestine) 28: 161-171, 1993 (in Japanese, Abstract in English)."},{"key":"6","unstructured":"6. Inoue K, Fujisawa T, Chinuki D, Kushiyma Y. Characteristics of gastric mucosa in gastric cancer improvement: Examination from a clinical survey by endoscopy. I to Cho (Stomach and Intestine) 44: 1367-1373, 2009 (in Japanese, Abstract in English)."},{"key":"7","unstructured":"7. Doyama H, Nakanishi H, Tsuyama S, et al. Magnifying narrow band imaging for determining the lateral extent of <i>Helicobacter pylori<\/i>-negative undifferentiated gastric cancer. I to Cho (Stomach and Intestine) 49: 889-901, 2014 (in Japanese, Abstract in English)."},{"key":"8","unstructured":"8. Mishima T, Chonan A, Ando M, Tamura T, Kusaka T, Mochizuki F. Endoscopic diagnosis of the intramucosal extent of infiltration in flat or depressed type early gastric cancers. I to Cho (Stomach and Intestine) 36: 1249-1256, 2001 (in Japanese, Abstract in English)."},{"key":"9","unstructured":"9. 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