1. College of Nursing, Chungnam National University, Daejeon, Korea.
2. Department of Nursing, Korea National University of Transportation, Jeungpyeong, Korea.
3. Department of Nursing, The College of Health and Welfare Woosong University, Daejeon, Korea.
4. Department of Internal Medicine, College of Medicine, Chungnam, Korea.National University, Daejeon, Korea.