Department of Cardiothoracic Surgery The Second Affiliated Hospital of North Sichuan Medical College Sichnan Mianyang 404 Hospital Mianyang 621000 China;
Department of Cardiothoracic Surgery The First Affiliated Hospital of Chongqing University of Medical Sciences Chongqing 400016 China;
Department of Cardiothoracic Surgery The First Affiliated Hospital of Chongqing University of Medical Sciences Chongqing 400016 China;