1 Department of Gastroenterology, General Hospital, Ningxia Medical University, Yinchuan, Ningxia, China.
2 School of Clinical Medicine, Ningxia Medical University, Yinchuan, Ningxia, China.
3 Key Laboratory of Fertility Preservation and Maintenance of Ministry of Education, Department of Biochemistry and Molecular Biology, School of Basic Medical Sciences, Ningxia Medical University, Yinchuan, Ningxia, China.
4 Department of Oncology, Zhongda Hospital, Southeast University, Nanjing, Jiangsu, China. gaochanchan1981@163.com.
5 Department of Gastroenterology, General Hospital, Ningxia Medical University, Yinchuan, Ningxia, China. wangfang9803@163.com.