The value of preoperative sentinel lymph node contrast-enhanced ultrasound for breast cancer: a large, multicenter trial von Li, Juan, Li, Hui, Guan, Ling, Lu, Yun, Zhan, Weiwei, Dong, Yijie, Gu, Peng, Liu, Jian, Cheng, Wen, Na, Ziyue, Tang, Lina, Du, Zhongshi, Yang, Lichun, Hai, Saiping, Yang, Chen, Zheng, Qingqiu, Zhang, Yuhua, Wang, Shan, Li, Fang, Fu, Jing, Lu, Man

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