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In a recent. Zhao and colleagues measured the levels of formaldehyde in the air in 34 classrooms in…
In a recent. Zhao and colleagues measured the levels of formaldehyde in the air in 34 classrooms in the schools in the city of Taiyuan, China. On the same day, they gave questionnaires to 1993 students aged 11-15 in those schools, asking them whether they had experienced respiratory problems (such as asthma attacks, wheezing, or shortness of ...
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