1. Department of Mathematics and Statistics, Chonnam National University, Gwangju, Korea.
2. Department of Cardiovascular Medicine, Chonnam National University Hospital, Gwangju, Korea.
3. Seers Technology Co., Ltd., Pyeongtaek, Korea.
4. XRAI, Gwangju, Korea.
5. Department of Internal Medicine, Chonnam National University Medical School, Gwangju, Korea.