| Literature DB >> 17768524 |
Einar Heldal1, Rui Maria de Araujo, Nelson Martins, Jaime Sarmento, Constantino Lopez.
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Year: 2007 PMID: 17768524 PMCID: PMC2636387 DOI: 10.2471/blt.06.036087
Source DB: PubMed Journal: Bull World Health Organ ISSN: 0042-9686 Impact factor: 9.408