1. Center for Infection and Immunity, Columbia University, New York, New York, USA
2. Center for Genomic Sciences, United States Army Medical Research Institute for Infectious Diseases, Frederick, Maryland, USA
3. Center for Biodefense and Emerging Infectious Diseases, Department of Pathology, University of Texas Medical Branch, Galveston, TX, USA
4. National Center for Microbiology, Instituto de Salud ‘Carlos III’, Madrid, Spain