1. Department of Gastroenterology, Wonkwang University Sanbon Hospital, Gunpo, Korea.
2. Wonkwang Digestive Disease Research Institute, Wonkwang University, Iksan, Korea.
3. Department of Physiology and Institute of Wonkwang Medical Science, Wonkwang University School of Medicine, Iksan, Korea.
4. Department of Radiology and Institute for Metabolic Disease, Wonkwang University, Iksan, Korea.
5. Department of Gastroenterology, Wonkwang University Hospital, Iksan, Korea.