1. Department of Emergency Medicine Chang Gung Memorial Hospital Linkou and College of Medicine Chang Gung University Tao‐Yuan Taiwan
2. Department of Emergency Medicine Ton‐Yen General Hospital Zhubei Taiwan
3. Institute of Epidemiology and Preventive Medicine College of Public Health National Taiwan University Taipei Taiwan
4. Department of Emergency Medicine Chang Gung Memorial Hospital Taipei Branch Taipei Taiwan
5. Department of Emergency Medicine Taoyuan General Hospital Ministry of Health and Welfare Taoyuan Taiwan
6. Biostatistics Unit Clinical Trial Center Chang Gung Memorial Hospital Linkou Taiwan
7. Department of Internal Medicine National Taiwan University Hospital Taipei Taiwan