1. Department of Cell Biology and Anatomy, College of Medicine, National Cheng Kung University, Tainan, Taiwan 701, R.O.C.
2. Institute of Basic Medical Sciences, College of Medicine, National Cheng Kung University, Tainan, Taiwan 709, R.O.C.
3. Department of Physical Medicine and Rehabilitation, National Cheng Kung University Hospital, College of Medicine, National Cheng Kung University, Tainan, Taiwan 709, R.O.C.
4. Department of Obstetrics and Gynecology, An Nan Hospital, China Medical University, Tainan, Taiwan 709, R.O.C.