治疗水平I。证据等级的完整描述见投稿须知。
Level of evidence Therapeutic level I. See Instructions to Authors for a complete description of levels of evidence.
证据水平：治疗II I级。对证据水平的详尽描述见投稿须知。
Level of evidence: Therapeutic level III. 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。
Level of evidence: Therapeutic level IV. See Instructions to Authors for a complete description of levels of evidence.
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