1. Department of Internal Medicine Wonkwang University Hospital
2. The Institute of Wonkwang Medical Science, Iksan,
3. Departments of Internal Medicine and Cardiovascular Surgery, Chonnam National University Hospital
4. Research Institute of Medical Sciences, Chonnam National University Medical School
5. Department of Life Science, Kwangju Institute of Science and Technology,
6. Department of Thoracic and Cardiovascular Surgery, Wonkwang University Hospital