When it comes to getting a lot of information in a short period, a questionnaire may be the answer. Questionnaires contain lists of questions in open-ended or closed-ended formats. While it takes time ...
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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