title: The performance of a food frequency questionnaire (FFQ) with a 7-day diet diary in estimating nitrogen and potassium intake.
authors.forename: Nick
authors.initials: N
authors.lastname: Day
mesh_terms: D015415:Biomarkers; D002149:Energy Intake; D006801:Humans; D009749:Nutrition Surveys; D011795:Surveys and Questionnaires
chemical_list: D015415:Biomarkers