PMID: 10434464 [PubMed - indexed for MEDLINE]
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[Commun Dis Rep CDR Suppl. 2000]
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[Commun Dis Rep CDR Wkly. 1998]
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[Commun Dis Rep CDR Suppl. 1999]
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[J Public Health Med. 1997]
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[Commun Dis Intell. 1997]
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