1. Niwa H (1968) Improvement of fibrogastroscope for biopsy and application of color television and high frequent currents for endoscopic biopsy (in Japanese). Gastroenterol Endosc 10:315
2. Tsuneoka K, Uchida T (1969) Fibergastroscopic polypectomy with snare method and its significance developed in our department: polyp resection and recovery instruments (in Japanese with English abstract). Gastroenterol Endosc 11:174–184
3. Tada M, Shimada M, Murakami F, et al (1984) Development of the strip-off biopsy (in Japanese with English abstract). Gastroenterol Endosc 26:833–839
4. Schlemper RJ, Itabashi M, Kato Y, et al (1997) Differences in diagnosis criteria for gastric carcinoma between Japanese and Western pathologists. Lancet 349:1725–1729
5. Tominaga S (ed) (1999) The research group for population-based cancer registration in Japan: cancer incidence in Japan. Cancer mortality and morbidity statistics, Japan and the world—1999. Japan Scientific Societies Press, Tokyo, pp 83–144