1 Department of Gastroenterology, General Hospital of Shenyang Military Area, Shenyang (Xingshun Qi, Xiaozhong Guo) ; Xijing Hospital of Digestive Diseases, Fourth Military Medical University, Xi'an (Xingshun Qi, Daiming Fan), China.
2 Department of Gastroenterology, General Hospital of Shenyang Military Area, Shenyang (Xingshun Qi, Xiaozhong Guo).
3 Xijing Hospital of Digestive Diseases, Fourth Military Medical University, Xi'an (Xingshun Qi, Daiming Fan), China.