[1] Manchester Royal Infirm, Dept Otolaryngol, Manchester, England
[2] Manchester Royal Infirm, Dept Microbiol, Manchester, England
[3] Manchester Royal Infirm, Dept Radiol, Manchester, England
[4] Wythenshawe Hosp, Dept Microbiol, Manchester, England
[5] Preston Royal Hosp, Dept Radiol, Preston, England
[6] Sheffield Teaching Hosp, Dept Otolaryngol, Sheffield, England
[7] Sheffield Teaching Hosp, Dept Microbiol, Sheffield, England
[8] Hull Univ Teaching Hosp, Dept Otolaryngol, Kingston Upon Hull, England
[9] Hull Univ Teaching Hosp, Dept Microbiol, Kingston Upon Hull, England
[10] Hull Univ Teaching Hosp, Dept Radiol, Kingston Upon Hull, England
[11] Newcastle Upon Tyne NHS Hosp, Dept Otolaryngol, Newcastle Upon Tyne, England
[12] Newcastle Upon Tyne NHS Hosp, Dept Radiol, Newcastle Upon Tyne, England
[13] Sunderland Royal Hosp, Dept Otolaryngol, Sunderland, England
[14] Sunderland Royal Hosp, Dept Microbiol, Sunderland, England
[15] Sunderland Royal Infirm, Dept Radiol, Sunderland, England
[16] Doncaster Royal Infirm, Dept Otolaryngol, Doncaster, England
[17] Doncaster Royal Infirm, Dept Microbiol, Doncaster, England
[18] York Hosp, Dept Otolaryngol, York, England
[19] York Hosp, Dept Microbiol, York, England
[20] York Hosp, Dept Radiol, York, England
[21] Stepping Hill Hosp, Dept Otolaryngol, Stockport, England
[22] Stepping Hill Hosp, Dept Microbiol, Stockport, England
[23] St Johns Hosp, Dept Otolaryngol, Livingston, Scotland
[24] Univ Manchester, Dept Otolaryngol, Manchester, England
[25] Univ Sheffield, Dept Otolaryngol, Sheffield, England
[26] Preston Royal Hosp, Dept Otolaryngol, Preston, England