Sun Hwa Lee1, Seong Jong Yun2. 1. Department of Emergency Medicine, Sanggye Paik Hospital, Inje University College of Medicine, 1342 Dongil-ro, Nowon-gu, Seoul, 139-707, Republic of Korea. 2. Department of Radiology, Aerospace Medical Center, Republic of Korea Air Force, PO Box 335-21, 635 Danjae-ro, Namil-myeon, Cheongwon-gun, Chungcheongbuk-do, 363-849, Republic of Korea. zoomknight@naver.com.