1. Department of Physiology, Chonnam National University Medical School, Gwangju 501-757, Korea.
2. Department of Pathology, College of Medicine, Chosun University, Gwangju 501-759, Korea.
3. Department of Internal Medicine, College of Medicine, Chosun University, Gwangju 501-759, Korea.
4. Department of Dermatology, Hallym University Dongtan Sacred Heart Hospital, Hwaseong 445-907, Korea.
5. Department of Physiology, College of Medicine, Chosun University, Gwangju 501-759, Korea.