1. Translational Medicine Program, Infection and Immunity Unit, Microbiology Service, Hospital Clínico Universitario-IECSCYL, Valladolid, Spain.
2. Respiratory Medicine Service, Hospital Clínico Universitario, Valladolid, Spain.
3. Internal Medicine Service, Hospital Clínico Universitario, Valladolid, Spain.
4. Intensive Medicine Service, Hospital Clínico Universitario, Valladolid, Spain.
5. Microbiology Service, Hospital Clínico Universitario, Valladolid, Spain.