School of Medicine, Northwest University for Nationalities, Gansu Province Lanzhou 730030, China;
Donggang Branch of First Hospital of Lanzhou University, Gansu Province Lanzhou 730020, China;
School of Medicine, Northwest University for Nationalities, Gansu Province Lanzhou 730030, China;
School of Medicine, Northwest University for Nationalities, Gansu Province Lanzhou 730030, China;
School of Medicine, Northwest University for Nationalities, Gansu Province Lanzhou 730030, China;