The present status of ultrasonic mass survey on Kumamoto Prefectural Welfare Federation of Agriculture Cooperatives - MATSUMOTO, Yasutaka; YOSHIMATSU, Shunji; TAKAHASHI, Mutsumasa; FURUSAWA, Mitsuhiro; NISHIMURA, Ryuichi; TSUCHIGAME, Tadatoshi; MORISHITA, Shoji; SHIBATA, Hiroe; UENO, Sukeyoshi; NISHIMOTO, Kiichi; SHIRAISHI, Keiko; INOKUCHI, Satoshi; et al. (Journal of Gastroenterological Mass Survey, 1992)