Double contrast–enhanced ultrasonography for the preoperative evaluation of gastric cancer: A comparison to endoscopic ultrasonography with respect to histopathology by Zheng, Zhiqiang, M.D, Yu, Yaojun, M.D, Lu, Mingdong, M.D, Sun, Weijian, M.D, Wang, Feihai, M.D, Li, Pihong, M.D, Zhang, Yi, M.D, Lin, Limiao, M.D, Huang, Pingtong, M.D, Chen, Jianming, M.D, Zhang, Haiyan, M.D, Xie, Zuokai, M.D, Da (Eric) Dong, Xiang, M.D., F.A.C.S

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