Given that the study objective is to seek only the usual food consumption without information on the portions?
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
I am very grateful for your answer
Thank you
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