1. Medical Research Center, Yue Bei People's Hospital, Shantou University Medical College, Wujiang, Shaoguan, Guangdong 512025, P.R. China
2. Department of Radiotherapy, Yue Bei People's Hospital, Shantou University Medical College, Wujiang, Shaoguan, Guangdong 512025, P.R. China
3. Institute of Cell Biology, Zhejiang University School of Medicine, Hangzhou, Zhejiang 310058, P.R. China
4. Department of Histology and Embryology, Shantou University Medical College, Shantou, Guangdong 515041, P.R. China