1. Key Laboratory of Cancer Cellular and Molecular Pathology, Cancer Research Institute of Medical College, University of South China, Hengyang, Hunan 421001, P.R. China
2. Department of Pediatrics, Shaoyang Medical School, Shaoyang, Hunan 422000, P.R. China
3. Clinical Medicine Undergraduate Program, Medical College, University of South China, Hengyang, Hunan 421001, P.R. China