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follow up in cohort study
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follow up in cohort study
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follow up in cohort study
随访
通过定期或者不定期的访问、检查等确定研究对象是否仍在队列中,收集研究对象的资料,评估暴露状态及可能的混杂因素,获取结局事件发生情况的方法。
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Air operation planning
airosol
air particulates collection efficiency
air passenger transport
air passenger transport sales agency
air path
airphoto
air pillar emergency rescue tent
airplane autonomous integrity monitoring
airplane-based observatory
airplane-based telescope
airplane borne instrument
airplane borne telescope
airplane seeder
airpoise
air pollutant
air pollutants discharge standard
air pollution
air pollution auto monitoring system
air pollution auto-monitoring system
Air Pollution Control
air pollution control and health protection
air pollution control chemistry
Air Pollution Control Law
air pollution control of mobile sources
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