1. Department of Emergency Medicine, MacKay Memorial Hospital, Taipei 104, Taiwan
2. Department of Medicine, MacKay Medical College, New Taipei City 252, Taiwan
3. MacKay Junior College of Medicine, Nursing, and Management, Taipei 112, Taiwan
4. Department of Linguistics, Indiana University, Bloomington, IN 47405, USA
5. Institute of Mechatronic Engineering, National Taipei University of Technology, Taipei 106, Taiwan
6. Graduate Institute of Injury Prevention and Control, College of Public Health and Nutrition, Taipei Medical University, Taipei 110, Taiwan