Validation of a food-frequency questionnaire for cohort studies in rural Japan

Keiko Ogawa, Yoshitaka Tsubono, Yoshikazu Nishino, Yoko Watanabe, Takayoshi Ohkubo, Takao Watanabe, Haruo Nakatsuka, Nobuko Takahashi, Mieko Kawamura, Ichiro Tsuji, Shigeru Hisamichi