1 Bacterial Pathogenesis Unit, Laboratory of Clinical Infectious Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health , Bethesda, MD , USA.
2 Department of Microbiology and Immunology, Stanford School of Medicine, Stanford University , Stanford, CA , USA.
3 Zentrum für Infektiologie, Medizinische Mikrobiologie und Hygiene, Universitätsklinikum Heidelberg , Heidelberg , Germany.