1. Clinical Research Center; Guangdong Medical University; Zhanjiang 524001 China
2. Department of Respiratory Medicine; Affiliated Hospital of Guangdong Medical University; Zhanjiang 524001 China
3. Department of Cardiothoracic Surgery; Affiliated Hospital of Guangdong Medical University; Zhanjiang 524001 China
4. The First Affiliated Hospital; Medical School of Xi'an Jiaotong University; Xi'an Shanxi 710061 China