1. Department of Electrical Engineering, National Cheng Kung University, Tainan, Taiwan;
2. School of Data and Computer Science, Sun Yat-Sen University, Guangzhou, China;
3. School of Speech Language Pathology and Audiology, Chung Shan Medical University, Taichung, Taiwan;
4. Department of Otolaryngology, Chung Shan Medical University Hospital, Taichung, Taiwan