Porrini, M <br/><br/>
Biochemical validation of a self-administered semi-quantitative food-frequency questionnaire.  [electronic resource] 

 -  The British journal of nutrition  Sep 1995 
 - 323-33 p.  digital 
<br/><br/> Publication Type: Journal Article; Research Support, Non-U.S. Gov't 
<br/><br/><label>ISSN: </label>0007-1145 
<br/><br/><label>Standard No.: </label>10.1079/bjn19950138  doi 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Adult<br/>Ascorbic Acid--blood<br/>Carotenoids--blood<br/>Diet Records<br/>Eating<br/>Female<br/>Humans<br/>Male<br/>Nitrogen--analysis<br/>Phosphorus--urine<br/>Potassium--urine<br/>Reproducibility of Results<br/>Surveys and Questionnaires<br/>Urea--urine<br/>Vitamin E--blood<br/>beta Carotene