1. Department of Nursing, Chonnam National University, Gwangju, Korea.
2. Department of Cardiovascular Medicine, Chonnam National University Medical School, Gwangju, Korea.
3. Department of Cardiovascular Medicine, Chonnam National University Hospital, Gwangju, Korea.
4. Department of Cardiology, Chonnam National University Hwasun Hospital, Hwasun, Korea.