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The discrepancy between perception of prescribing factors and purchase statistics of NSAIDS was possibly explained by a high degree of conformity to clinic guidelines. Our preliminary results indicate that perception of prescribing factors of NSAIDS among orthopedics should be surveyed in multicenter or multinational studies.OBJECTIVE This study aimed to assess the validity and reliability of a dish-based, semi-quantitative food frequency questionnaire (DFFQ) for epidemiological studies in Iran. The DFFQ included 142 items (84 fo