1. Department of Paediatrics, Division of Paediatric Infectious Diseases, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland
2. Third Department of Paediatrics, Aristotle University of Thessaloniki School of Medicine, Ippokration General Hospital, Thessaloniki, Greece
3. Department of Paediatric Infectious Diseases and Immunology, Radboud Center for Infectious Diseases, Amalia Children’s Hospital
4. Department of Laboratory Medicine, Laboratory of Medical Immunology, Radboud University Medical Center, Nijmegen, the Netherlands
5. Department of Paediatrics and Child Health, Faculty of Medicine and Health Sciences, Stellenbosch University, Cape Town, South Africa.