1. Infectious Diseases UnitDepartment of PediatricsHospital General Universitario Gregorio Marañón Madrid Spain
2. PhD Program in MedicineUniversidad Complutense Madrid Spain
3. Department of PediatricsHospital General Universitario Gregorio Marañón Madrid Spain
4. Pediatric Hematology and Oncology UnitDepartment of PediatricsHospital General Universitario Gregorio Marañón Madrid Spain