1. Department of Gastroenterology; The First Affiliated Hospital; Sun Yat-Sen University; Guangzhou Guangdong Province China
2. Department of Gastroenterology; The Sixth Affiliated Hospital; Sun Yat-Sen University; Guangzhou Guangdong Province China
3. Department of Medical Genetics; Zhongshan School of Medicine and Center for Genome Research; Sun Yat-Sen University; Guangzhou Guangdong Province China