Influence of Individually Estimated Portion Size Data on the Validity of a Semiquantitative Food Frequency Questionnaire

Anne Tjønneland(University of Copenhagen), Ole Møller Jensen(Danish Cancer Society), Kim Overvad(Aarhus University), Marianne Ewertz(Odense University Hospital), Jóhanna Haraldsdóttir(Department of Agricultural Sciences), Connie Stripp(Danish Cancer Society)
International Journal of Epidemiology
January 1, 1992
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