Phân tích tư tưởng của nhân dân qua đoạn thơ: Những người vợ nhớ chồng… Những cuộc đời đã hóa sông núi ta trong Đất nước của Nguyễn Khoa Điềm
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Recent studies have used as a reference group womenwho had no exposure to tobacco smoke - that is, they havenever actively or passively smoked. These studies in mostcases have reported increases in breast cancer risk forwomen who smoked or were passively exposed to tobaccosmoke compared to reference women who were neverexposed. Critics of this approach cite studies that indicatethe reference women who have never been exposed totobacco smoke are healthier, in general. They argue thatthe difference in risk is due to the better health of thesewomen used as references for risk. Older studies used asa reference...
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