1. Department of Otorhinolaryngology—Head and Neck SurgeryUnited Christian Hospital and Tseung Kwan O Hospital Tseung Kwan O Hong Kong
2. Department of Otorhinolaryngology—Head and Neck Surgery, Prince of Wales HospitalThe Chinese University of Hong Kong Shatin Hong Kong
3. Division of Head and Neck Surgery, Department of OtolaryngologyStanford University Palo Alto California USA
4. Department of Speech TherapyPrince of Wales Hospital Shatin Hong Kong