title: Invited commentary: comparison of food frequency questionnaires.
authors.affiliation: Department of Epidemiology and Nutrition, Harvard School of Public Health, Boston, MA 02115, USA.
authors.forename: W C
authors.initials: WC
authors.lastname: Willett
mesh_terms: D004034:Diet Surveys; D005502:Food / Q000706:statistics & numerical data*; D006801:Humans; D015203:Reproducibility of Results; D011795:Surveys and Questionnaires