1 National Defense Medical Center, Tri-Service General Hospital, Department of Emergency Medicine, Taipei, Taiwan.
2 National Defense Medical Center, Tri-Service General Hospital, Department of Otorhinolaryngology - Head and Neck Surgery, Taipei, Taiwan.
3 National Defense Medical Center, Tri-Service General Hospital, Department of Internal Medicine, Taipei, Taiwan.
4 National Defense Medical Center, Tri-Service General Hospital, Department of Neurological Surgery, Taipei, Taiwan.
5 National Defense Medical Center, Tri-Service General Hospital, Department of Emergency Medicine, Taipei, Taiwan. Electronic address: tsaishihung@yahoo.com.tw.