Department of General Surgery, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, 510080, Guangdong Province, PR China; Shantou University Medical College, Shantou, 515041, Guangdong Province, PR China. Department of General Surgery, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, 510080, Guangdong Province, PR China. Department of General Surgery, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, 510080, Guangdong Province, PR China; School of Medicine, South China University of Technology, Guangzhou, 510006, Guangdong Province, PR China. Department of General Surgery, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, 510080, Guangdong Province, PR China; Shantou University Medical College, Shantou, 515041, Guangdong Province, PR China; School of Medicine, South China University of Technology, Guangzhou, 510006, Guangdong Province, PR China. Electronic address: syyaoxueqing@scut.edu.cn.