[1] Taipei Med Univ, Wan Fang Med Ctr, Inst Injury Prevent & Control, Taipei 110, Taiwan
[2] Taipei Med Univ, Wan Fang Med Ctr, Dept Neurol Surg, Taipei 110, Taiwan
[3] Taipei Med Univ, Wan Fang Med Ctr, Dept Emergency Med, Taipei 110, Taiwan
[4] Fu Jen Catholic Univ, Sch Med, Taipei 242, Taiwan
[5] Shin Kong W Ho Su Mem Hosp, Dept Neurol Surg, Taipei 111, Taiwan
[6] Lo Tung POHAI Hosp, Dept Neurol Surg, Ilan 265, Taiwan
[7] Natl Taiwan Univ Hosp, Dept Neurol Surg, Taipei 100, Taiwan
[8] MacKay Mem Hosp, Dept Neurol Surg, Taipei 104, Taiwan
[9] Taipei City Hosp, Renai Branch, Div Neurosurg, Taipei 106, Taiwan