1 School of Medicine, Chung Shan Medical University, Taichung, Taiwan.
2 Department of Emergency Medicine, Kaohsiung Veterans General Hospital, Kaohsiung, Taiwan.
3 Department of Emergency Medicine, E-Da Dachang Hospital, I-Shou University, Kaohsiung City, Taiwan; School of Medicine for International Students, College of Medicine, I-Shou University, Kaohsiung City, Taiwan. Electronic address: lawrence.c.k.sun@gmail.com.
4 Department of Emergency Medicine, Kaohsiung Municipal Min-Sheng Hospital, Kaohsiung, Taiwan.