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Validity of a self-administered food frequency questionnaire (FFQ) and its generalizability to the estimation of dietary folate intake in Japan

Junko Ishihara email, Seiichiro Yamamoto email, Hiroyasu Iso email, Manami Inoue email and Shoichiro Tsugane email for the JPHC FFQ Validation Study Group

Nutrition Journal 2005, 4:26doi:10.1186/1475-2891-4-26

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