1 Department of Thoracic Surgery, Hebei General Hospital, Shijiazhuang, 050057, People's Republic of China; Graduate School, Hebei Medical University, Shijiazhuang, 050011, People's Republic of China.
2 Department of Thoracic Surgery, Hebei General Hospital, Shijiazhuang, 050057, People's Republic of China; Graduate School, Hebei North University, Zhangjiakou, 075000, People's Republic of China.
3 Department of Thoracic Surgery, Children's Hospital of Hebei Province, Shijiazhuang, 050000, People's Republic of China. Electronic address: duanguoc@126.com.