Zhang Jian1, Huang Shaohong1, Zhong Wenzhao2, Gu Lijia3. 1. Thoracic Surgery Department, Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, China. 2. Guangdong Lung Cancer Institute, Guangdong General Hospital and Guangdong Academy of Medical Sciences, Guangzhou, China. 3. Thoracic Surgery Department, Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, China. Electronic address: zssyxxwk@163.com.