1. Department of Breast Surgery, Guizhou Provincial People's Hospital, Guiyang, Guizhou 550002, P.R. China
2. Department of Oncology, Guizhou Provincial People's Hospital, Guiyang, Guizhou 550002, P.R. China
3. Department of Radiation Oncology, Fudan University Shanghai Cancer Center, Shanghai 200032, P.R. China