1. Department of Internal Medicine, Research Institute of Clinical Medicine, Biomedical Research Institute, Jeonbuk National University Medical School, Jeonbuk National University, Jeonju 54907, Republic of Korea
2. Department of Internal Medicine, Medical School, Chonnam National University, Gwangju 61469, Republic of Korea
3. Department of Internal Medicine, Digestive Diseases Research Institute, School of Medicine, Wonkwang University, Iksan 54538, Republic of Korea
4. Department of Internal Medicine, College of Medicine, Chosun University, Gwangju 61452, Republic of Korea