1. Medical College, Guangxi University, Nanning, Guangxi Zhuang Autonomous Region 530004, P.R. China
2. Intensive Care Unit, The People’s Hospital of Guangxi Zhuang Autonomous Region, Guangxi Academy of Medical Sciences, Nanning, Guangxi Zhuang Autonomous Region 530021, P.R. China
3. Department of Thoracic Surgery, The People's Hospital of Guangxi Zhuang Autonomous Region, Guangxi Academy of Medical Sciences, Nanning, Guangxi Zhuang Autonomous Region 530021, P.R. China