1. Department of Pediatric Infectious Disease and Immunology, Erasmus Medical Center (MC), University Medical Center Rotterdam, Rotterdam, The Netherlands;
2. Department of Immunology, Erasmus MC, University Medical Center Rotterdam, Rotterdam, The Netherlands;
3. Department of Pediatric Infectious Disease and Immunology, Nijmegen Institute for Infection, Immunity and Inflammation, Radboud University Nijmegen Medical Center, Nijmegen, The Netherlands;
4. Department of Pediatrics, Jeroen Bosch Hospital, Hertogenbosch, The Netherlands; and
5. Department of Biostatistics, Erasmus MC, University Medical Center Rotterdam, Rotterdam, The Netherlands