1 Department of Cell Biology, Faculty of Biology, Complutense University of Madrid, Madrid, Spain.
2 Servicio de Microbiologia, Hospital Universitario Ramon y Cajal and Instituto Ramon y Cajal de Investigación Sanitaria, Madrid, Spain.
3 Department of Microbiology, Infectious Diseases and Immunology, Charité - Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Berlin, Germany.