1. Department of Neurosurgery, Taipei Medical University–Shuang Ho Hospital, Taipei, Taiwan.
2. Department of Neurosurgery, Taipei Medical University–Wanfang Hospital, Taipei, Taiwan.
3. Department of Neurosurgery, Kurume University School of Medicine, Kurume, Japan.
4. Department of Neurosurgery, Uijongbu St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea.
5. Department of Neurosurgery, Shanghai Renji Hospital, School of Medicine, Shanghai Jiaotong University, Shanghai, China.