1. Department of Otolaryngology, National Taiwan University Hospital, Jen-Ai Road, Taipei 100, Taiwan
2. Department of Otolaryngology, Head and Neck Surgery, University of Pittsburgh Medical Center, Pittsburgh, PA 15213, USA
3. Department of Otorhinolaryngology, Head and Neck Surgery, Aichi Medical University School of Medicine, Aichi 480-1195, Japan
4. Department of Otolaryngology, Head and Neck Surgery, Stanford University School of Medicine, Stanford, CA 94305, USA
5. Department of Otolaryngology, Head and Neck Surgery, Chinese Hong Kong University, Hong Kong
6. Department of Otorhinolaryngology, Head and Neck Surgery, Changhua Christian Hospital, Chung Shan Medical University, Changhua, Taiwan