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C. Inwezerua was supported by a grant of the Scholarship Program for Young African Researchers of Coimbra Group, University of Coimbra, Portugal. N. Mendonça and S. Domingues were supported by the grants SFRH/BPD/45815/2008 and SFRH/BD/49061/2008, respectively, from Fundação para a Ciência e a Tecnologia, Lisbon, Portugal. This work was supported financially by the ESCMID 2010 Research Grant from the European Society of Clinical Microbiology and Infectious Diseases, the PTDC/AGR-ALI/113953/2009 project from Fundação para a Ciência e a Tecnologia and by the Center for Pharmaceutical Studies, University of Coimbra.