1. Department of Thoracic Surgery, The Third Affiliated Hospital of Southern Medical University, Guangzhou, Guangdong 510500, P.R. China
2. Department of Thoracic Surgery, Shanwei People's Hospital, Shanwei, Guangdong 516600, P.R. China
3. Department of Neurology, The Third Affiliated Hospital of Southern Medical University, Guangzhou, Guangdong 510500, P.R. China