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Japan Epidemiological Association, Journal of Epidemiology, 1sup(13), p. 102-105, 2003
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Validity of a Self-administered Food Frequency Questionnaire in the 5-year Follow-up Survey of the JPHC Study Cohort I to Assess Sodium and Potassium Intake: Comparison with Dietary Records and 24-hour Urinary Excretion Level
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