1. Pharmaco and Device Epidemiology, Centre for Statistics in Medicine ‐ Nuffield Department of Orthopaedics, Rheumatology, and Musculoskeletal Sciences University of Oxford UK
2. Otorhinolaryngology Department Hospital Josep Trueta Girona Spain
3. Otorhinolaryngology Department Fundación Jiménez Díaz Madrid Spain
4. Otorhinolaryngology Department Hospital General de Catalunya Sant Cugat Spain
5. Otorhinolaryngology Department Hospital Rey Juan Carlos Madrid Spain
6. Otorhinolaryngology Department Hospital Príncipe de Asturias Alcalá de Henares Spain
7. Otorhinolaryngology Department Hospital Universitario de La Paz Madrid Spain
8. Otorhinolaryngology Department Hospital Clínico de Valladolid Valladolid Spain
9. Otorhinolaryngology Department Hospital Universitario de Fuenlabrada Fuenlabrada Spain
10. Otorhinolaryngology Department Hospital Gregorio Marañón Madrid Spain
11. Otorhinolaryngology Department Mútua de Terrassa Terrassa Spain
12. Otorhinolaryngology Department Fundació Althaia Manresa Spain
13. Otorhinolaryngology Department Hospital Universitari Joan XXIII Tarragona Spain
14. Otorhinolaryngology Department Hospital Universitario General de Villalba Madrid Spain
15. Otorhinolaryngology Department Hospital de Donosti Donosti Spain
16. Otorhinolaryngology Department Hospital de la Santa Creu i Sant Pau Barcelona Spain
17. Otorhinolaryngology Department Hospital Universitario Lucus Augusti Lugo Spain
18. Otorhinolaryngology Department Hospital de Torrejón Madrid Spain
19. Clin Research/epidemiol In Pneumonia & Sepsis (CRIPS)‐ Vall d'Hebrón Institute of Research (VHIR) Barcelona Spain
20. Medical Intensive Care Unit Hospital Clínic de Barcelona, UB, IDIBAPS Barcelona Spain
21. Otorhinolaryngology Department Hospital Clínic de Barcelona, UB, IDIBAPS Barcelona Spain
22. Head Neck Clínic, Agència de Gestió d'Ajuts Universitaris i de Recerca AGAUR, 2017‐SGR‐01581 Barcelona Spain
23. Centro de Investigación Biomédica en Red sobre Enfermedades Respiratorias (CIBERes) Bunyola Spain