Results. The majority of studies found were level IV, with only limited numbers of higher level studies.
结果：多数研究的可信度级别为IV级，仅有少数为高水平研究。
Level of evidence: Therapeutic level IV. See Instructions to Authors for a complete description of levels of evidence.
证据等级：治疗性研究IV级。关于证据等级的完整描述详见投稿须知。
Level of evidence: Therapeutic level IV. See Instructions to Authors for a complete description of levels of evidence.
证据等级：治疗性研究IV级。关于证据等级的完整描述详见投稿须知。
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