1. Department of Emergency Medicine, Chungbuk National University Hospital, Cheongju-si, Chungcheongbuk-do, Republic of Korea
2. Department of Paramedic Science, Korea National University of Transportation, Jeungpyeong-gun, Chungcheongbuk-do, Republic of Korea
3. Strategic Research, Laerdal Medical, Stavanger, Norway
4. Department of Emergency Medicine, College of Medicine, Chungbuk National University, Cheongju-si, Chungcheongbuk-do, Republic of Korea