Conclusions: Exposure to environmental tobacco smoke is associated with an increased risk for multiple sclerosis.
结论：环境性吸烟暴露与多发性硬化的患病风险增加相关。
Conclusions Environmental lead exposure is associated with an increased prevalence of dental caries in the us population.
结论：环境性铅接触与美国居民龋齿发生率增多相关。
Conclusions Environmental lead exposure is associated with an increased prevalence of dental caries in the us population.
结论：环境性铅接触与美国居民龋齿发生率增多相关。
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