1. Guangdong Provincial Key Laboratory of Gastroenterology, Department of Gastroenterology, Nanfang Hospital; Southern Medical University
2. Department of Neurology, Beijing Tiantan Hospital; Capital Medical University
3. Department of Gastroenterology; Third Affiliated Hospital of Southern Medical University; Guangzhou Guangdong Province
4. Department of Gastroenterology, Beijing Tsinghua Changgung Hospital Medical Center; Tsinghua University; Beijing China