Nature
Vol.463, No.7279, 21 January 2010
Science
Vol.327, No.5963, 13 January 2010
South African Medical Journal
Vol.100, No.1, January 2010
Epidemiology and Infection
Vol.138, Issue 2, Fabruary 2010
Cadernos de Saude Publica
Vol.25, Suplemento 3, 2009
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