[1] Warwick Hosp, Dept Otorhinolaryngol & Head & Neck Surg, Warwick, England
[2] Queen Elizabeth Hosp, Dept Otorhinolaryngol & Head & Neck Surg, Birmingham, England
[3] Univ Hosp Coventry & Warwickshire NHS Trust, Dept Otorhinolaryngol & Head & Neck Surg, Coventry, England
[4] Warwick Hosp, Dept Otorhinolaryngol & Head & Neck Surg, Lakin Rd, Warwick CV34 5BW, England