1. Oral Cancer Research Center, Changhua Christian Hospital, Changhua 500, Taiwan
2. Doctoral Program in Tissue Engineering and Regenerative Medicine, College of Medicine, National Chung Hsing University, Taichung 402, Taiwan
3. Graduate Institute of Biomedical Sciences, China Medical University, Taichung 404, Taiwan
4. Department of Otorhinolaryngology, Head and Neck Surgery, Changhua Christian Hospital, Changhua 500, Taiwan
5. Department of Post-Baccalaureate Medicine, College of Medicine, National Chung Hsing University, Taichung 402, Taiwan