1 Taiwan Society of Emergency Medicine, Taipei, Taiwan; Division of Geriatric Emergency Medicine, Department of Emergency Medicine, Chi Mei Medical Center, Tainan, Taiwan; Department of Emergency Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan. Electronic address: chienchenghuang@yahoo.com.tw.
2 Taiwan Society of Emergency Medicine, Taipei, Taiwan; Department of Emergency Medicine, Chang Gung Memorial Hospital, Linkou and College of Medicine, Chang Gung University, Tao-Yuan, Taiwan.
3 Health Promotion Administration, Ministry of Health and Welfare, Taipei, Taiwan.