1. Department of Emergency Medicine, Chungbuk National University Hospital, Cheongju-si, Chungcheongbuk-do, South Korea
2. Department of Emergency Medicine, College of Medicine, Chungbuk National University, Cheongju-si, Chungcheongbuk-do, South Korea
3. Strategic Research, Laerdal Medical, Stavanger, Norway
4. Korea Construction Equipment Manufactures Association, Seongnam-si, Gyeonggi-do, South Korea