1. Department of Gastroenterology, General Hospital of Northern Theater Command, Shenyang, China.
2. Postgraduate College, Jinzhou Medical University, Jinzhou, China.
3. Department of Hepatobiliary Surgery, General Hospital of Northern Theater Command, Shenyang, China.
4. Department of Radiology, General Hospital of Northern Theater Command, Shenyang, China.
5. Department of Pathology, General Hospital of Northern Theater Command, Shenyang, China.