Department of Thoracic and Cardiovascular Surgery;
the Catholic University of Korea;
Seoul 137-701;
Korea;
Department of Surgery;
the Catholic University of Korea;
Seoul 137-701;
Korea;
Department of Internal Medicine;
the Catholic University of Korea;
Seoul 137-701;
Korea;
Department of Preventive Medicine;
the Catholic University of Korea;
Seoul 137-701;
Korea;