1. Department of Otolaryngology, Hospital Universitario de Fuenlabrada, Fuenlabrada, Spain;
2. Department of Otolaryngology, Clínica Universidad de Navarra, Pamplona, Spain;
3. Otolaryngology Head and Neck Surgery, USP Hospital, Marbella, Spain;
4. Department of Otolaryngology, Asia Sleep Centre, Paragon Medical Centre, Singapore