1. The Second School of Clinical Medicine, Guangzhou University of Chinese Medicine, Guangzhou, Guangdong, P. R. China
2. Center of TCM applications Perioperative, Guangdong Provincial Hospital of Chinese Medicine, Guangzhou, Guangdong, P. R. China
3. Department of Gastrointestinal Surgery, Guangdong Provincial Hospital of Chinese Medicine, Guangzhou, Guangdong, P. R. China
4. Key Unit of Methodology in Clinical Research, The Second Affiliated Hospital of Guangzhou University of Chinese Medicine, Guangzhou, Guangdong, P. R. China
5. Department of Global Public Health, Karolinska Institute, Stockholm, Sweden
6. Department of Colorectal Surgery, Guangdong Provincial Hospital of Chinese Medicine, Guangzhou, Guangdong, P. R. China