%0 Journal Article %T Difficult-to-treat asthma, is it really difficult? %A Al-Hajjaj Mohamed %J Annals of Thoracic Medicine %D 2011 %I Medknow Publications %U http://www.thoracicmedicine.org/article.asp?issn=1817-1737;year=2011;volume=6;issue=1;spage=1;epage=2;aulast=Al-Hajjaj