1. Department of Spleen and Stomach Diseases, The First Affiliated Hospital of Guangzhou University of Chinese Medicine, Guangzhou, Guangdong 510405, P.R. China
2. First Clinical Medical College, Guangzhou University of Chinese Medicine, Guangzhou, Guangdong 510405, P.R. China
3. Pi‑Wei Institute, Guangzhou University of Chinese Medicine, Guangzhou, Guangdong 510405, P.R. China
4. Department of Gastroenterology, The Second Affiliated Hospital, Sun Yat‑Sen University, Guangzhou, Guangdong 510120, P.R. China