Quality assurance in a phase III, multicenter, randomized trial of POstmastectomy radioThErapy in Node posiTive breast cancer with or without Internal mAmmary nodaL irradiation (PO... oleh Yu-Chun Song, Zhi-Hui Hu, Xue-Na Yan, Hui Fang, Yu Tang, Hao Jing, Kuo Men, Na Zhang, Jun Zhang, Jing Jin, Qiu-Zi Zhong, Jun Ma, Wei-Fang Yang, Ya-Hua Zhong, Li-Hua Dong, Xiao-Hong Wang, Hong-Fen Wu, Xiang-Hui Du, Xiao-Rong Hou, Jian Tie, Yu-Fei Lu, Li-Na Zhao, Ye-Xiong Li, Shu-Lian Wang