1 Department of Gastroenterology, the First People's Hospital of Yunnan Province, Affiliated Hospital of Kunming University of Science and Technology, Kunming, China.
2 Yunnan Digestive Endoscopy Clinical Medical Center, Kunming, China.
3 Department of Pathology, the First People's Hospital of Yunnan Province, Affiliated Hospital of Kunming University of Science and Technology, Kunming, China.