1. Department of Otolaryngology-Head and Neck Surgery, The First Affiliated Hospital, Guangzhou Medical University, Guangzhou, Guangdong, China
2. Department of Otolaryngology, Sleep Center, Chang Gung Memorial Hospital, Chang Gung University, Taipei, Taiwan
3. Department of Physics, School of Science, South China University of Technology, Guangzhou, China
4. State Key Laboratory of Respiratory Disease, The First Affiliated Hospital, Guangzhou Medical University, Guangzhou, Guangdong, China