Study Design. A cluster randomized controlled trial and economic evaluation with a 12-month follow-up and with work department as the unit of randomization.
研究设计：这是一个随机对照试验，并且我们同劳动部门一起，对随机的单位进行了随访12个月的经济效益评估。
Study Design. A cluster randomized controlled trial and economic evaluation with a 12-month follow-up and with work department as the unit of randomization.
研究设计：这是一个随机对照试验，并且我们同劳动部门一起，对随机的单位进行了随访12个月的经济效益评估。
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