%0杂志文章%A Hasford, J. %A Virchow, J. C. %T长效β对哮喘患者死亡率的影响₂-激动剂%D 2006 %R 10.1183/ 09031936.00085606% J欧洲呼吸杂志%P 900- 902% V 28% N 5% U //www.qdcxjkg.com/content/erj/28/5/900.full.pdf