a Department of Thoracic Surgery, Qinghai Provincial People's Hospital, Xining 810007, Qinghai Province, China;
a Department of Thoracic Surgery, Qinghai Provincial People's Hospital, Xining 810007, Qinghai Province, China;
a Department of Thoracic Surgery, Qinghai Provincial People's Hospital, Xining 810007, Qinghai Province, China;
Department of Thoracic Surgery, Tongji Hospital, Tongji Medical Col ege, Huazhong University of Science and Technology, Wuhan 430030, China;
Department of Thoracic Surgery, Tongji Hospital, Tongji Medical Col ege, Huazhong University of Science and Technology, Wuhan 430030, China;