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<正>原文出处ZENG L,BRIGNARDELLO-PETERSEN R,HULTCRANTZ M,et al. GRADE guidelines 32:GRADE offers guidance on choosing targets of GRADE certainty of evidence ratings. J Clin Epidemiol,2021,137:163-175．原文通讯作者ZENG L,email:zengll5@mcmaster.
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<正>原文出处ZENG L,BRIGNARDELLO-PETERSEN R,HULTCRANTZ M,et al. GRADE guidelines 32:GRADE offers guidance on choosing targets of GRADE certainty of evidence ratings. J Clin Epidemiol,2021,137:163-175．原文通讯作者ZENG L,email:zengll5@mcmaster.
