[1] Lund Univ, Dept Otorhinolaryngol Head & Neck Surg, Fac Med, Skane Univ Hosp, SE-20502 Malmo, Sweden
[2] Lund Univ, Dept Clin Sci, Fac Med, Skane Univ Hosp,Div Gastroenterol, SE-20502 Malmo, Sweden
[3] Copenhagen Univ Hosp, Dept Otolaryngol Head & Neck Surg, Rigshosp, Copenhagen, Denmark
[4] Lund Univ, Fac Med, Dept Hlth Sci, Lund, Sweden