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Hofman A, Valkenburg HA, Vaandrager GJ.Hofman A, et al.J Epidemiol Community Health. 1980 Sep;34(3):179-81. doi: 10.1136/jech.34.3.179.J Epidemiol Community Health. 1980.PMID: 7441137Free PMC article.
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Hofman A, Grobbee DE, Valkenburg HA.Hofman A, et al.Ned Tijdschr Geneeskd. 1985 Apr 6;129(14):639-41.Ned Tijdschr Geneeskd. 1985.PMID: 3990857Dutch.No abstract available.