1. Department of Gastroenterology, The First Hospital of Lanzhou University, Lanzhou, Gansu 730000, P.R. China
2. Department of Clinical Laboratory Diagnosis, School of Clinical Medicine, Gansu University of Chinese Medicine, Lanzhou, Gansu 730000, P.R. China
3. Division of Cardiac Surgery, Gansu Provincial Maternal and Child Health Hospital, Lanzhou, Gansu 730050, P.R. China
4. Department of Pediatrics, The First Hospital of Lanzhou University, Lanzhou, Gansu 730000, P.R. China
5. Division of Neurosurgery, Second Hospital of Lanzhou University, Lanzhou, Gansu 730000, P.R. China
6. Department of Surgical Oncology, The First Hospital of Lanzhou University, Lanzhou, Gansu 730000, P.R. China