A nitrous oxide/oxygen fixed mixture to reduce pain induced by the hypodermic injection: study protocol for a randomized, controlled trial by Jun-Jun Zhang, Ping Yu, Hui Dang, Cheng-Shuang Feng, Xiu-Jiang Long, Wen-Fa Huang, Lei Wang, Jie-Ling Li, Guo-Liang Tian, Jia-Quan Wen, Jun-Hui Mei, Yu-Xiang Li

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