1. Department of Otorhinolaryngology—Head and Neck SurgeryUnited Christian Hospital and Tseung Kwan O Hospital Tseung Kwan O New Territories Hong Kong
2. Department of Otorhinolaryngology—Head and Neck SurgeryThe Chinese University of Hong Kong Shatin New Territories Hong Kong
3. Department of AnesthesiologyTseung Kwan O Hospital Tseung Kwan O Hong Kong