Trial limitation: You can use Time Sled no more 4 hours per day and can't use several features in TS Reporter.
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The limitation is this is not the original trial, this is a subgroup analysis.
该试验的局限是，这不是原创的试验，而是一个亚组分析。
A limitation of the study was that the trial lacked statistical power for the composite outcome of risk for death from cardiovascular causes or nonfatal myocardial infarction.
这项研究的一个限制是缺乏心脏血管原因死亡或是非致命性心肌梗塞综合预后的统计力量。
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