The EPIC-Norfolk Study

The performance of a food frequency questionnaire (FFQ) with a 7-day diet diary in estimating nitrogen and potassium intake.

International Journal of Epidemiology 2002 ; 31: 692-3.

and Day N

PubMed ID : 12162248

PMCID :

URL : https://pubmed.ncbi.nlm.nih.gov/12162248/

Abstract

The performance of a food frequency questionnaire (FFQ) with a 7-day diet diary in estimating nitrogen and potassium intake.

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