Affiliation: | 1.Department of Radiation Oncology, The Second Affiliated Hospital University of South China, Hengyang, Hunan 421001, P.R. China;2.Clinical Research Center for Prevention and Treatment of Breast & Thyroid Disease in Hunan Province, Hengyang, Hunan 421001, P.R. China;3.Department of Preventive Medicine, Hunan Polytechnic of Environment and Biology, Hengyang, Hunan 421001, P.R. China |