[1] Skane Univ Hosp, Inst Clin Sci, Dept Resp Med & Allergol, Lund, Sweden
[2] Univ Med Ctr Groningen, Dept Clin Pharm & Pharmacol, Groningen, Netherlands
[3] QPS NL, Groningen, Netherlands
[4] Univ Amsterdam, Amsterdam UMC, Dept Resp Med, Amsterdam, Netherlands
[5] Transylvania Univ Brasov, Brasov, Romania
[6] Tech Univ Munich, Dept Otorhinolaryngol, Klinikum Rechts Isar, Munich, Germany
[7] Tech Univ Munich, Ctr Allergy & Environm, Klinikum Rechts Isar, Munich, Germany
[8] Univ Ghent, Dept Otorhinolaryngol, Ghent, Belgium
[9] Univ Hosp Leuven, Dept Otorhinolaryngol, Leuven, Belgium
[10] Univ Amsterdam, Amsterdam UMC, Dept Otorhinolaryngol, Amsterdam, Netherlands
[11] McMaster Univ, Div Respirol, Dept Med, Hamilton, ON, Canada
[12] St Josephs Healthcare, Hamilton, ON, Canada
[13] Natl Univ Ireland, Dept Med, APC Microbiome Ireland, Cork, Ireland
[14] Natl Univ Ireland, Dept Microbiol, APC Microbiome Ireland, Cork, Ireland
[15] Charles Univ Prague, Fac Med Pilsen, Dept Allergol & Clin Immunol, Prague, Czech Republic
[16] Charles Univ Prague, Fac Med 2, Pediat Dept, Div Pediat Resp Dis, Prague, Czech Republic
[17] Univ Hosp Motol, Prague, Czech Republic
[18] Charles Univ Prague, Fac Med 1, Dept Resp Med, Prague, Czech Republic
[19] Thomayer Hosp, Prague, Czech Republic