1. Institute of Medicine, Chung Shan Medical University, Taichung 402, Taiwan
2. Department of Medical Research, Chung Shan Medical University Hospital, Taichung 402, Taiwan
3. Graduate Institute of Applied Living Science, Tainan University of Technology, Tainan City 710, Taiwan
4. Department of Pharmacology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore 119077
5. Tissue Culture Center, New York Eye and Ear Infirmary, New York Medical College, New York, NY 10009, USA