1National Heart, Lung, and Blood Institute; National Asthma Education and Prevention Program Asthma and Pregnancy Working Group. NAEPP expert panel report. Managing asthma during pregnancy: recommendations for pharmacologic treatment 2004 update[J]. J Allergy Clin Immunol, 2005,115 (1):34-46.
3Bliass M S,National Institute of Health. Management of asthma during pregnancy[J]. Allergy Asthma Proc, 2004.25 (6) : 375- 379.
4Bracken M B,Triehe E W, gelanger K,et al. Asthma syrup toms,severity,and drug therapy:a prospective study of effect on 2 205 pregnancies[J]. Obstet Gynecol, 2003,102(4) : 739-752.
