7Leonardi G S, Houthuijs D, Nikifomv B, et al. Respiratorysymp- toms,bronchitis and asthma in children of central an d eastern Eu- rope[ J]. Eur Respir J,2002,20(4) :890 -898. 被引量:1
8Luyt D K, Burton P R, Simpson H. Epidemiological study ofwheeze, doctor diagnosed asthma, and cough in preschool children in Lo ic- estemhire[ J]. Br Mad J, 1993,306 : 1386 - 1390. 被引量:1