%0 Journal Article %A Padmaja Subbarao %A Piush J Mandhane %A Malcolm R Sears %T Asthma: epidemiology, etiology and risk factors %D 2009 %R 10.1503/cmaj.080612 %J Canadian Medical Association Journal %U https://www.cmaj.ca/content/cmaj/early/2009/09/14/cmaj.080612.full.pdf