1. Department of Thoracic and Cardiovascular Surgery; Korea University Anam Hospital; Seoul 02841 Republic of Korea
2. Anatomy, School of Medicine; Catholic University of Daegu; Gyeongbuk 38430 Republic of Korea
3. Department of Thoracic and Cardiovascular Surgery; Seoul National University Bundang Hospital; Gyeonggi-do 13602 Republic of Korea
4. Biomedical Engineering and Radiology, School of Medicine; Catholic University of Daegu; Gyeongbuk 38430 Republic of Korea
5. Department of Pathology; Seoul National University Bundang Hospital; Gyeonggi-do 13602 Republic of Korea
6. Department of Pathology; Seoul National University College of Medicine; Seoul 03080 Republic of Korea
7. Department of Thoracic and Cardiovascular Surgery, College of Medicine; Seoul National University; Seoul 03080 Republic of Korea