1. Departmento de Microbiología, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, Mexico City, Mexico
2. Laboratory of Microbiology, Ghent University, Gent, Belgium
3. Pôle of Medical Microbiology, Institute of Experimental and Clinical Research, Université Catholique de Louvain, Brussels Belgium
4. Janssen Research and Development, Beerse, Belgium