1. Department of Respiratory Medicine, Royal Brompton Hospital, London SW3 6NP, U.K.
2. School of Chemistry, University of Bristol, Bristol BS8 1TS, U.K.
3. Department of Respiratory Medicine, Chelsea & Westminster Hospital, London SW10 9NH, U.K.
4. National Heart and Lung Institute, Guy Scadding Building, Imperial College London, London SW3 6LY, U.K.
5. Department of Ear, Nose and Throat Surgery, Guy’s & St. Thomas NHS Foundation Trust, London SE1 9RT, U.K.
6. Department of Speech and Language Therapy (ENT), Royal National Ear, Nose and Throat and Eastman Dental Hospitals, University College London Hospitals NHS Foundation Trust, London WC1E 6DG, U.K.
7. Institute of Sport, Exercise and Health (ISEH), UCL, London W1T 7HA, U.K.
8. Ear, Nose and Throat Department, Wexham Park Hospital, Slough SL2 4HL, U.K.
9. Department of Bioengineering, Imperial College London, London SW7 2AZ, U.K.
10. Fortius Clinic, London W1H 6EQ, U.K.