1. Research Institute for Nursing Science, Keimyung University, College of Nursing, Daegu, Korea.
2. Cell Therapy and Tissue Engineering Center, Yonsei University, Wonju College of Medicine, Wonju, Korea.
3. Department of Internal Medicine, Yonsei University, Wonju College of Medicine, Wonju, Korea.
4. Institute of Occupation and Environmental Medicine, Yonsei University, Wonju College of Medicine, Wonju, Korea.