1. Department of Basic Nursing Science and Institute for Nursing Science, Keimyung University, Daegu 704-701, Korea.
2. Department of Physiology, Yonsei University Wonju College of Medicine, Wonju 220-701, Korea.
3. Department of Biochemistry, Yonsei University Wonju College of Medicine, Wonju 220-701, Korea.
4. Department of Pharmacology, Yonsei University Wonju College of Medicine, Wonju 220-701, Korea.