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Bull World Health Organ. 2004 Oct;82(10):802-3.
Langer A, Díaz-Olavarrieta C, Berdichevsky K, Villar J.
Population Council, Regional Office for Latin America and the Caribbean, Panzacola 62-102, Coyoacan, Mexico City 04000, Mexico. alanger@popcouncil.org.mx
PMID: 15643806 [PubMed - indexed for MEDLINE]PMCID: PMC2623037Free PMC Article
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