[1] Lund Univ, Malmo Univ Hosp, Dept Otorhinolaryngol, Malmo, Sweden
[2] Queen Silvia Childrens Hosp, Dept Pediat, Gothenburg, Sweden
[3] AstraZeneca R&D, Lund, Sweden
[4] Karolinska Inst, Natl Inst Environm Med, Stockholm, Sweden
[5] Lund Univ, Malmo Univ Hosp, Dept Lab Med Med Microbiol, Malmo, Sweden
[6] Karolinska Inst, Dept Otorhinolaryngol, Stockholm, Sweden