1. Department of Infectious Diseases, The First Affiliated Hospital of Chengdu Medical College, Chengdu, PRC
2. Department of Cardiology, Sun Yat-sen Memorial Hospital, Sun Yat-sen University, Guangzhou, Guangdong, PRC
3. Department of Gastroenterology, Guangdong General Hospital and Guangdong Academy of Medical Sciences, Guangzhou, Guangdong, PRC