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