A large epidemiologicalstudy to document the overall public health effects on children and adolescents of living with dogs and cats.
大量的流行病学研究结果是否记录了哪些生活中有猫或者狗这类宠物的孩子的公共健康状况。
2
Whether or not the cleaning products are a direct cause of asthma, or simply a trigger for people who already have the disease, isn't clear from this epidemiologicalstudy.
但这次的流行病学研究并没有清楚的表明，清洁产品是导致哮喘的直接原因还是仅仅只是哮喘患者的诱因。
3
Comment: in a previous epidemiologicalstudy, the prevalence of dysmenorrhea was inversely associated with dietary intake of both fish oil and vitamin B12.