1. Department of Biomedical Gerontology, Graduate School of Hallym University, Chuncheon, Korea.
2. Department of Internal Medicine, Hallym University Medical Center, Anyang, Korea.
3. Institute for Liver and Digestive Diseases, Hallym University, Chuncheon, Korea.
4. Ilsong Institute of Life Science, Hallym University, Anyang, Korea.
5. Department of Internal Medicine, Kangdong Sacred Heart Hospital of Hallym University Medical Center, Seoul, Korea.
6. Department of Internal Medicine, Chuncheon Sacred Heart Hospital of Hallym University Medical Center, Chuncheon, Korea.