Yu-Chang Liu1, Wei-Jing Lee2. 1. Department of Emergency Medicine, Chi Mei Medical Center, No. 901, Zhonghua Rd., Yongkang Dist., Tainan City, 710, Taiwan. 2. Department of Emergency Medicine, Chi Mei Medical Center, No. 901, Zhonghua Rd., Yongkang Dist., Tainan City, 710, Taiwan. echolee1103@gmail.com.