1. Institute of Injury Prevention and Control, Taipei Medical University, Taipei 110, Taiwan
2. College of Public Health and Nutrition, Taipei Medical University, Taipei 110, Taiwan
3. International SOS, Taipei 104, Taiwan
4. Ministry of Health and Welfare, Taipei 115, Taiwan
5. Division of Gastroenterology, Department of Internal Medicine, Wan Fang Hospital, Taipei Medical University, Taipei 116, Taiwan
6. Department of Emergency, College of Medicine, Shuang Ho Hospital, Taipei Medical University, Taipei 235, Taiwan