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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, Seiichiro Yamamoto, Hiroyasu Iso, Manami Inoue, Shoichiro Tsugane* and the JPHC FFQ Validation Study Group

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

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