1. Department of Anesthesiology, Chi Mei Medical Center, Tainan City, Taiwan
2. Department of Emergency Medicine, E-Da Hospital, I-Shou University, Kaohsiung City, Taiwan
3. School of Medicine, College of Medicine, I-Shou University, Kaohsiung City, Taiwan
4. Department of Emergency Medicine, E-Da Dachang Hospital, I-Shou University, Kaohsiung City, Taiwan