1. Department of Pediatrics, St Louis University School of Medicine, St Louis, Missouri, USA
2. Department of Pediatrics, University of Texas Medical Branch, Galveston, Texas, USA
3. Department of Translational Medicine, Lund University, Malmo, Sweden
4. Department of Pediatrics, University of Turku and Turku University Hospital, Turku, Finland
5. The Research Institute at Nationwide Children’s Hospital and Ohio State University, Columbus, Ohio, USA
6. Department of Otorhinolaryngology, University of Helsinki and Helsinki University Hospital, Helsinki, Finland
7. Department of Epidemiology of Microbial Diseases, Yale School of Public Health, New Haven, Connecticut, USA
8. Department of Microbiology and Immunology, Wake Forest University, Winston-Salem, North Carolina, USA