BACKGROUND: Venipuncture is one of the most common methods in the clinical treatment.
张萍背景：静脉穿刺是临床治疗最常用的方法之一。
Methods The random clinical study with double blind was used.
方法采取随机双盲对照临床研究。
Methods Analysis of the clinical data.
方法分析临床资料，复习有关文献。
Methods: Take the method of radom and clinical control experiment.
方法：采用随机、临床对照实验方法。
METHODS: It was a randomized, double blind, double model, parallel controlled clinical trial.
方法：采用随机、双盲双模拟、平行对照方法。
Methods: Clinical application and experimental study were carried out.
方法：通过临床应用和实验研究的方法。
Methods. Clinical data were obtained from the medical record.
方法：从病历记录中获得相关的临床资料。
Methods. Clinical data were obtained from the medical record.
方法：从病历记录中获得相关的临床资料。
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