1. Department of Otolaryngology, Kaohsiung Chang Gung Memorial Hospital and Chang Gung University College of Medicine, Kaohsiung 83301, Taiwan
2. Department of Speech-Language Pathology, Duquesne University, Pittsburgh, PA 15282, USA
3. Department of Audiology and Speech Language Pathology, Mackay Medical College, Taipei 10449, Taiwan
4. Department of Otorhinolaryngology, Head and Neck Surgery, University of Malaya, 506030 Kuala Lumpur, Malaysia
5. Department of Otolaryngology, Seoul National University College of Medicine, Seoul 110-744, Republic of Korea
6. ENT Departments, Hôpital Femme-Mère-Enfant and Edouard Herriot University Hospitals, Claude Bernard University, 69003 Lyon, France