Commentary: Dietary diaries versus food frequency questionnaires-a case of undigestible data.
Willett
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Department of Nutrition, Harvard School of Public Health, and the Channing Laboratory, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, USA.
D015930:Diet Records; D004034:Diet Surveys; D002149:Energy Intake; D006801:Humans; D015203:Reproducibility of Results; D012107:Research Design; D011795:Surveys and Questionnaires