Open Access Research

Relative validity of the food frequency questionnaire used to assess dietary intake in the Leiden Longevity Study

Martinette T Streppel*, Jeanne HM de Vries, Saskia Meijboom, Marian Beekman, Anton JM de Craen, P Eline Slagboom and Edith JM Feskens

Nutrition Journal 2013, 12:75  doi:10.1186/1475-2891-12-75

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