1. Department of Pharmacology, Inha University School of Medicine, Incheon 400-712, Korea
2. Hypoxia-related Disease Research Center, Inha University School of Medicine, Incheon 400-712, Korea
3. Department of Emergency Medicine, Inha University Hospital, Incheon 400-712, Korea
4. Department of Emergency Medicine, Inje University Ilsan Paik Hospital, Ilsan 411-706, Korea
5. Department of Pathology and Laboratory Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, 19104, USA