1. Geriatric Emergency Medicine Unit, The Department of Emergency Medicine, Vajira Hospital, Navamindradhiraj University, Bangkok, Thailand.
2. The Department of Emergency Medicine, Vajira Hospital, Navamindradhiraj University, Bangkok, Thailand.
3. The Department of Emergency Medicine, Massachusetts General Hospital, Harvard University, Boston, Massachusetts, USA.
4. The Clinical Research Center, Vajira Hospital, Navamindradhiraj University, Bangkok, Thailand.
5. Thai Health Promotion Organization (ThaiHealth), Bangkok, Thailand.