1. Department of Diagnostic Radiology, Severance Hospital and Research Institute of Radiological Science, Yonsei University College of Medicine, Seoul, Korea.
2. Institute of Gastroenterology and Brain Korea 21 Project for Medical Science, everance Hospital and Research Institute of Pathological Science, Yonsei University College of Medicine, Seoul, Korea.
3. Department of Pathology, everance Hospital and Research Institute of Pathological Science, Yonsei University College of Medicine, Seoul, Korea.