1. Department of Gastroenterology General Hospital of Northern Theater Command Shenyang China
2. Postgraduate College Shenyang Pharmaceutical University Shenyang China
3. Postgraduate College China Medical University Shenyang China
4. Department of Gastroenterology The 960th Hospital of the PLA Jinan China
5. Medicina Interna 1 ARNAS Civico‐Di Cristina‐Benfratelli Palermo Italy