The Validity of a Short Food Frequency Questionnaire and its Ability to Measure Changes in Food Intake: A Longitudinal Study

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Abstract
Osler M (Department of Social Medicine, University of Copenhagen, Panum Institute, Blegdamsvej 3, 2200 Copenhagen N, Denmark) and Heitmann B L. The validity of a short food frequency questionnaire and its ability to measure changes in food intake: A longitudinal study. International Journal of Epidemiology 1996; 25: 1023–1029.