An evaluation of screening for asymptomatic gastric cancer using serum pepsinogen I and II - KOUMOTO, Kunihiko; TANAKA, Shinji; SUMII, Koji; HARUMA, Ken; WATANABE, Chiyuki; YOSHIHARA, Masaharu; OKAMOTO, Shiro; KAWAGUCHI, Hiroyuki; THUDA, Toshitaka; KODOI, Atsunori; KAJIYAMA, Goro (Journal of Gastroenterological Mass Survey, 1994)