1. Department of Medical Oncology, General Hospital of Ningxia Medical University, Yinchuan, P.R. China.
2. The Third Department of Medicine Oncology, General Hospital of Ningxia Medical University, Yinchuan, P.R. China.
3. The Second Department of Medicine Oncology, General Hospital of Ningxia Medical University, Yinchuan, P.R. China.
4. Department of Paediatrics, Tianjin Jinnan Xiaozhan Hospital, Tianjin, P.R. China.