1. Servicio de Microbiología, Hospital Universitario Ramón y Cajal and Instituto Ramón y Cajal de Investigación Sanitaria (IRYCIS), Madrid, Spain
2. CIBER de Enfermedades Infecciosas, Instituto de Salud Carlos III, Madrid, Spain
3. Division of Infectious Diseases, Department of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania, USA
4. Department of Pathology, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA