1. Department of Internal Medicine, Chonnam National University Medical School, Gwangju, Korea.
2. 3Department of Laboratory Medicine, Chonnam National University Medical School, Hwasun, Korea.
3. 1Department of Laboratory Medicine, Chonnam National University Medical School, Gwangju, Korea.
4. 2Department of Internal Medicine, Chonnam National University Medical School, Hwasun, Korea.