1. Graduate Institute of Clinical Medicine, Shuang Ho Hospital, Taipei Medical University, Taipei, Taiwan.
2. Department of Surgery, Buddhist Tzu Chi General Hospital, Taipei, Taiwan.
3. Graduate Institute of Disease Prevention and Control, Shuang Ho Hospital, Taipei Medical University, Taipei, Taiwan.
4. Department of Neurosurgery, Mackay Memorial Hospital, Taipei, Taiwan.
5. Department of Medical Research, Chi Mei Medical Center, Tainan, Taiwan.
6. Department of Neurosurgery, Shuang Ho Hospital, Taipei Medical University, Taipei, Taiwan.