1. Cancer Center, The First Hospital of Jilin University; Changchun 130021 China
2. Department of Radiation-Oncology; The First Hospital of Jilin University; Changchun 130021 China
3. Health Examination Center, The First Hospital of Jilin University; Changchun 130021 China
4. Kosair Children's Hospital Research Institute, Departments of Pediatrics, Radiation Oncology; Pharmacology and Toxicology of the University of Louisville; Louisville KY 40202