1 Department of Neurosurgery, Kaohsiung Chang Gung Memorial Hospital, Chang Gung University College of Medicine, Kaohsiung 83301, Taiwan.
2 Department of Neurology, Kaohsiung Chang Gung Memorial Hospital, Kaohsiung 83301, Taiwan ; Department of Biological Science, National Sun Yat-Sen University, Kaohsiung 80424, Taiwan.
3 Department of Anesthesiology, Kaohsiung Medical University Hospital, Kaohsiung 807, Taiwan.
4 Department of Neuropathology, University of Pittsburgh Medical Center, Pittsburgh, PA 15213, USA.