[1] Danish Hlth & Med Author, Copenhagen, Denmark
[2] Odense Univ Hosp, Dept ENT Head & Neck Surg, Odense, Denmark
[3] Vejle Hosp, Dept Otorhinolaryngol, Vejle, Denmark
[4] Univ Southern Denmark, Inst Publ Hlth, Res Unit Gen Practice, Odense, Denmark
[5] ENT Private Clin, Aarhus, Denmark
[6] Slagelse Hosp, Dept Clin Microbiol, Slagelse, Denmark
[7] Aalborg Univ, Ctr Clin Guidelines, Dept Hlth Sci & Technol, Aalborg, Denmark
[8] ENT Private Clin, Odense, Denmark
[9] Rigshosp, Dept Otorhinolaryngol Head & Neck Surg & Audiol, Copenhagen, Denmark
[10] Bond Univ, Ctr Res Evidence Based Practice, Gold Coast, Qld, Australia
[11] Rigshosp, Dept Paediat & Adolescent Med, Copenhagen, Denmark
[12] Aalborg Univ Hosp, Med Lib, Aalborg, Denmark
[13] Koge Univ Hosp, Dept Otorhinolaryngol & Maxillofacial Surg, Koge, Denmark