Hou-Chuan Lai1, Hui-Wen Tai1, Zhi-Fu Wu2. 1. Department of Anesthesiology, Tri-Service General Hospital and National Defense Medical Center, #325, Section 2, Chenggung Road, Neihu 114, Taipei, Taiwan, ROC. 2. Department of Anesthesiology, Tri-Service General Hospital and National Defense Medical Center, #325, Section 2, Chenggung Road, Neihu 114, Taipei, Taiwan, ROC. Electronic address: aneswu@gmail.com.