Ethnic differences in serum pepsinogen levels among japanese and non-japanese brazilian gastric cancer patients and controls - Fahey, Michel T; Hamada, Gerson S; Nishimoto, Ines N; Kowalski, Luiz Paulo; Iriya, Kiyoshi; Gama Rodrigues, Joaquim José; Tsugane, Schoichiro (Cancer Detection and Prevention, 2000)