[1] Guys & St Thomas Hosp, Ent Dept, London, England
[2] Kings Coll London, London, England
[3] Univ Ghent, Upper Airways Res Lab, Ghent, Belgium
[4] Univ Ghent, Dept Otorhinolaryngol, Ghent, Belgium
[5] Ghent Univ Hosp, Ghent, Belgium
[6] Univ Stockholm, Karolinska Inst, Div Ent Dis, Clintec, Ghent, Belgium
[7] Univ Amsterdam, Med Ctr, Dept Otorhinolaryngol, Amsterdam, Netherlands
[8] CHU Montreal, Div Otolaryngol Head & Neck Surg, Montreal, PQ, Canada
[9] Univ Klinikum Dusseldorf, Hno Klin, Dept Otorhinolaryngol, Dusseldorf, Germany
[10] Univ Pittsburgh, Med Ctr, Dept Otolaryngol Head & Neck Surg, Pittsburgh, PA USA
[11] GlaxoSmithKline Res & Dev Ltd, Clin Sci, Stockley Pk, Uxbridge, Middx, England
[12] Gsk, Resp Therapeut Area Unit, Res Triangle Pk, NC USA
[13] Gsk, Global Med Affairs, Brentford, Middx, England
[14] Gsk, Clin Stat, Stockley Pk, Uxbridge, Middx, England
[15] Eastern Virginia Med Sch, Dept Otolaryngol Head & Neck Surg, Norfolk, VA 23501 USA