1. Department of Otolaryngology, Head and Neck Surgery, West China Hospital, Sichuan University, Chengdu, China.
2. Department of Otolaryngology, People's Hospital of the Tibet Autonomous Region, Lasha, China.
3. Department of Geriatrics, Center for Medical Stem Cell Biology, State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu, China.
4. Department of Otolaryngology, Head and Neck Surgery, Xinhua Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China.