1. Department of Gastroenterology, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, Guangdong, P. R. China
2. Guangdong Provincial Key Laboratory of Liver Disease Research, Guangzhou, Guangdong, P. R. China
3. Department of Laboratory Medicine, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, Guangdong, P. R. China