1 Department of Internal medicine, Pusan National University Yangsan Hospital, Medical Research Institute of Pusan National University, Geumo-ro 20, Beomeo-ri, Mulgeum-eup, Yangsan-si, Gyeongsangnam-do, 626-770, Republic of Korea.
2 Department of Thoracic and Cardiovascular Surgery, Pusan National University Yangsan Hospital, the Research Institute for Convergence of Biomedical Science and Technology, Pusan National University Yangsan Hospital, Geumo-ro 20, Beomeo-ri, Mulgeum-eup, Yangsan-si, Gyeongsangnam-do, 626-770, Republic of Korea. [email protected].