How can I validate the qualitative food frequency questionnaire?

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Dr. Senthilvel Vasudevan

Hi,

Your question: Validity of qualitative food frequency questionnaire

http://www.ncbi.nlm.nih.gov/pubmed/24083967

http://www.ncbi.nlm.nih.gov/pubmed/22843611

http://www.ncbi.nlm.nih.gov/pubmed/2843041

Kindly see the above articles. It would be very useful to you.

Thanks.

Senthilvel