1. Department of Internal Medicine Chungbuk National University Hospital Cheongju South Korea
2. Department of Internal Medicine Seoul National University College of Medicine and Seoul National University Bundang Hospital Seongnam South Korea
3. Department of Radiology Seoul National University College of Medicine and Seoul National University Bundang Hospital Seongnam South Korea
4. Physiologic Diagnostic Laboratory, Vascular Laboratory Seoul National University Bundang Hospital Seongnam South Korea