1. Department of Gastroenterology, General Hospital of Northern Theater Command (formerly General Hospital of Shenyang Military Area), Shenyang, China;
2. Department of Pharmacology, General Hospital of Northern Theater Command (formerly General Hospital of Shenyang Millitary Area), Shenyang, China;
3. Postgraduate College, Shenyang Pharmaceutical University, Shenyang, China;
4. Department of Internal Medicine II, University of Freiburg, Freiburg, Germany;
5. Postgraduate College, Jinzhou Medical University, Jinzhou, China;
6. Section of Medical Service, General Hospital of Northern Theater Command (formerly General Hospital of Shenyang Military Area), Shenyang, China