<?xml version="1.0"?>
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    <!-- 
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    <AnnotationProperty rdf:about="http://purl.obolibrary.org/obo/IAO_0000115"/>
    <AnnotationProperty rdf:about="http://purl.obolibrary.org/obo/in_minimal_requirements_subset"/>
    


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    <!-- http://purl.obolibrary.org/obo/OBIB_0000020 -->

    <Class rdf:about="http://purl.obolibrary.org/obo/OBIB_0000020">
        <rdfs:label xml:lang="en">patient questionnaire</rdfs:label>
    </Class>
    


    <!-- http://purl.obolibrary.org/obo/ONS_0000105 -->

    <Class rdf:about="http://purl.obolibrary.org/obo/ONS_0000105">
        <rdfs:label>Food Frequency Questionnaire</rdfs:label>
        <rdfs:subClassOf rdf:resource="http://purl.obolibrary.org/obo/OBIB_0000020"/>
        <ns2:in_minimal_requirements_subset rdf:datatype="http://www.w3.org/2001/XMLSchema#boolean">true</ns2:in_minimal_requirements_subset>
        <ns2:IAO_0000115>Finite list of foods and beverages with response categories to indicate usual frequency of consumption over the time period queried. The time period can vary (from 1 week to 1 year and over). To assess the total diet, the number of foods and beverages queried typically ranges from 80 to 120. Usual portion size can be asked separately for each food and beverage. Alternatively, portion size can be combined with frequency information by asking respondents to translate usual consumption amount to number of specified units (e.g., spoon, cup, glass, etc). Some questionnaires include portion size images in an attempt to enhance reporting  accuracy. In addition to foods and beverages, FFQs often ask about the frequency of intake and dosages of dietary supplements.</ns2:IAO_0000115>
        <ns2:IAO_0000117>ENPADASI_WP4</ns2:IAO_0000117>
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