Efficacy of quadruple regimen with polaprezinc for gastric Helicobacter pylori infection eradication: protocol for a single-centre, single-blind, non-inferiority, randomised clinic... by Jun Li, Tingting Chen, Wen Chen, Yujing Liu, Dingkun Wu, Zhen Sun, Tingyuan Li, Qinwen Tan, Haidong Jiang, Zhiqiang Yuan, Yuqian Zhao

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