1. Department of Medical Education and Research, Kaohsiung Veterans General Hospital , Kaohsiung, Taiwan
2. School of Medicine, National Defense Medical Center , Taipei, Taiwan
3. Department of Emergency Medicine, E-Da Dachang Hospital, I-Shou University , Kaohsiung, Taiwan
4. School of Medicine for International Students, College of Medicine, I-Shou University , Kaohsiung, Taiwan
5. Department of Emergency Medicine, Kaohsiung Veterans General Hospital , Kaohsiung, Taiwan
6. School of Medicine, Chung Shan Medical University , Taichung, Taiwan