To assess the validity and the reproducibility of a newly developed web-based, self-administered food frequency questionnaire (web-FFQ). To the best of our knowledge, no web-based FFQ has been ...
Objective: To assess the validity of a semi-quantitative food-frequency questionnaire (SFFQ) used in a large nation-wide dietary survey among 12-month-old Norwegian infants. Methods: The SFFQ was ...
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