1Department of Neurosurgery, China Medical University Hospital, Taichung, Taiwan, R.O.C.;
2Spine Center, China Medical University Hospital, Taichung, Taiwan, R.O.C.;
3Terry Fox Cancer Research Laboratory, Department of Medical Research, China Medical University Hospital, Taichung, Taiwan, R.O.C.;
4Graduate Institute of Biomedical Sciences, China Medical University, Taichung, Taiwan, R.O.C.;