J Haapakoski

Reproducibility and validity of dietary assessment instruments. II. A qualitative food frequency questionnaire.

J. Palmgren, D. Albanes, J. Virtamo, 1988, American journal of epidemiology.

Reproducibility and validity of dietary assessment instruments. I. A self-administered food use questionnaire with a portion size picture booklet.

J. Palmgren, D. Albanes, J. Virtamo, 1988, American journal of epidemiology.