Relative Validity and Reproducibility of a Web-Based Semi-Quantitative Food Frequency Questionnaire in the Danish Diet, Cancer, and Health-Next Generations MAX Study von Rostgaard-Hansen, Agnetha Linn, Rosthøj, Susanne, Brunius, Carl, Olsen, Sjurdur Frodi, Bjerregaard, Anne Ahrendt, Cade, Janet Elisabeth, Tjønneland, Anne, Landberg, Rikard, Halkjær, Jytte

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