国家自然科学基金81670605;北京市幽门螺杆菌感染和上消化道疾病重点实验室项目BZ0371;北京大学第三医院临床重点项目Y76493-05Fund program National natural science foundation of China81670605;Key laboratoryfor Helicobacter pylori infection and upper gastrointestinal diseases inBeijingBZ0371;Clinical key projects of Peking University Third HospitalY76493-05