1 Center for Vaccine Research, University of Pittsburgh, Pittsburgh, Pennsylvania, United States of America, 2 Department of Microbiology and Molecular Genetics, School of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania, United States of America, 3 Department of Pathology, School of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania, United States of America, 4 Department of Medicine, School of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania, United States of America
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Apetrei et al. (2012) studied this question.
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