1. Department of Gastroenterology, The First Hospital of Lanzhou University, Lanzhou, Gansu�730000, P.R.�China
2. Department of Gastroenterology, The First Hospital of Lanzhou University, Lanzhou, Gansu 730000, P.R. China
3. School of Pharmacy, Lanzhou University, Lanzhou, Gansu�730000, P.R.�China
4. The First Clinical Medical School of Lanzhou University, Lanzhou, Gansu�730000, P.R.�China
5. The First Clinical Medical School of Lanzhou University, Lanzhou, Gansu 730000, P.R. China
6. The Second Clinical Medical School of Lanzhou University, Lanzhou, Gansu�730000, P.R.�China
7. Department of Endocrinology, The First Hospital of Lanzhou University, Lanzhou, Gansu�730000, P.R.�China