1. Department of Otorhinolaryngology and Head and Neck Surgery, Stepping Hill Hospital; Stockport National Health Service Foundation Trust; Stockport United Kingdom
2. Department of Otorhinolaryngology and Head and Neck Surgery, Faculty of Medicine; University of Szeged; Szeged Hungary
3. Department of Anesthesiology and Intensive Therapy, Faculty of Medicine; University of Szeged; Szeged Hungary
4. Department of Otolaryngology-Head and Neck Surgery; University of Alabama at Birmingham; Birmingham Alabama U.S.A.