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Kenji YAMAO, Kose SEGAWA, Saburo NAKAZAWA, Yasuo NAITO, Eizo KIMOTO, Kazuo INUI, Yoshiki HAYASHI, Junichi KANO, Masahiro YAMADA, Masahiro MITAKE, Hidemi ZENDA. "Study of ultrasonic mass survey with special reference to intensive examination." Journal of Gastroenterological Mass Survey 1987.77 (1987) 71-77