A nitrous oxide/oxygen fixed mixture to reduce pain induced by the hypodermic injection: study protocol for a randomized, controlled trial.
Jun-Jun ZhangPing YuHui DangCheng-Shuang FengXiu-Jiang LongWen-Fa HuangLei WangJie-Ling LiGuo-Liang TianJia-Quan WenJun-Hui MeiYu-Xiang LiPublished in: Trials (2024)
Chinese Clinical Trial Register, ChiCTR2200061507. Registered on June 27, 2022. http://www.chictr.org.cn/edit.aspx?pid=170573&htm=4.