1. Division of Cardiology, Department of Internal Medicine, Wonkwang University Hospital, Wonkwang University School of Medicine, Iksan, Korea.
2. Regional Cardiocerebrovascular Center, Wonkwang University Hospital, Iksan, Korea.
3. Department of Preventive Medicine & Institute of Wonkwang Medical Science, Wonkwang University School of Medicine, Iksan, Korea.
4. Department of Nursing, Chonnam National University, Gwangju, Korea.