1. International Medical Services (IMS), Beijing Tiantan Hospital of Capital Medical University, No. 119 South Fourth Ring West Road, Fengtai District, Beijing, 100070, China
2. Department of Pathology, Beijing Tiantan Hospital of Capital Medical University, No. 119 South Fourth Ring West Road, Fengtai District, Beijing, 100070, China
3. Department of Gastroenterology, Henan Province Hospital of Traditional Chinese Medicine, Henan University of Chinese Medicine, No. 6 Dongfeng Road, Jinshui District, Zhengzhou, Henan, 450002, China