The study is taking place at 17 Ear, Nose and Throat outpatient clinics, district and teaching hospitals in Scotland, England and Wales.

Please note all links on this page will take you to external NHS trust websites.

The following NHS sites recruited patients to the NAIROS trial:

Aberdeen (Royal Infirmary)

Birmingham (Queen Elizabeth Hospital)

Bradford (Royal Infirmary)

Carlisle (Cumberland Infirmary)

Darlington (Memorial Hospital/University Hospital of North Durham)

Dundee (Ninewells Hospital)

Great Yarmouth (James Paget University Hospital)

Lanarkshire (Monklands Hospital)

Leeds (General Infirmary)

Liverpool (Aintree Hospital)

London (Guy's Hospital)

Newcastle (Freeman Hospital)

Newport (Royal Gwent Hospital)

Plymouth (Derriford Hospital)

Salisbury (District Hospital)

Stockport (Stepping Hill Hospital)

Wigan (Wrightington Hospital)