1 Section of Neurosurgery, Department of Surgery, Ditmanson Medical Foundation, Chia-Yi Christian Hospital, Chia-Yi City 600; Department of Biotechnology, Asia University, Taichung City 41354; Department of Neurological Surgery, Tri-Service General Hospital, National Defense Medical Center, Taipei 114, Taiwan.
2 Department of Neurological Surgery, Tri-Service General Hospital, National Defense Medical Center, Taipei 114; Division of Neurosurgery, Department of Surgery, Sijhih Cathay General Hospital, New Taipei City 22174; Department of Medicine, School of Medicine, Fu Jen Catholic University, New Taipei City 24205, Taiwan.