1. Pediatric Intensive Care Unit, Hospital Dona Estefânia, 1169-045 Lisboa, Portugal
2. Infectology Unit, Hospital Dona Estefânia, Rua Jacinta Marto, 1169-045 Lisboa, Portugal
3. Department of Immunology, Rheumatology and Stem Cell Transplantation, University Children's Hospital, 89073-89081 Ulm, Germany