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[Influenza activity 2000/2001].
Pechirra P, Rebelo-de-Andrade H, Guiomar R, Ribeiro C, Coelho A, Pedro S, George F. Pechirra P, et al. Acta Med Port. 2005 Jan-Feb;18(1):19-25. Epub 2005 Mar 11. Acta Med Port. 2005. PMID: 16202331 Free article. Portuguese.