Trẻ sinh vào mùa thu có nguy cơ mắc hen suyễn cao
Những trẻ sinh vào khoảng thời gian 4 tháng trước vụ rét có nguy cơ mắc hen suyễn cao hơn 30% so với các trẻ khác, các nhà khoa học Mỹ cho biết trên tạp chí Respiratory and Critical Care Medicine.
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