1. Health Center of Llanera (Asturias), Medicine Department, University of Oviedo, Asturias, Spain
2. Intensive Care Unit, Hospital Pulido Valente, Centro Hospitalar Lisboa Norte, Lisbon, Portugal
3. Asociación Española de Vacunología (AEV), Spain
4. Department of Pediatrics, Pediatric Infectology & Immunodeficiency Unit, Regional University Children´s Hospital of Malaga, Malaga, Spain
5. IBIMA Multidisciplinary Group for Pediatric Research of Malaga, Malaga University, Malaga, Spain
6. Department of Paediatrics, Translational Paediatrics & Infectious Diseases, Hospital Clínico Universitario de Santiago de Compostela, Santiago de Compostela, Spain
7. Instituto de Investigación Sanitaria de Santiago, Universidad de Santiago de Compostela, Santiago de Compostela, Spain