1. Department of Cardiothoracic Surgery, Wuhan Women and Children Medical Care Center, Wuhan, Hubei 430000, P.R. China
2. Department of Pathology, Xi'an XD Group Hospital, Xi'an, Shaanxi 710077, P.R. China
3. Department of Thoracic Surgery, The First People's Hospital of Qingdao Economic and Technological Development Zone, Qingdao, Shandong 266555, P.R. China