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References
1.The Global Initiative for Asthma (GINA) . GINA report, global strategy for asthma management and prevention . http://www.ginasthma.com/guidelineitem.asp??l1=2&l2=1&intId=1561. Accessed January 18, 2011.
2.National Asthma Education and Prevention Program . Expert Panel Report 3: Guidelines for the diagnosis and management of asthma . 2007 . http://www.nhlbi.nih.gov/guidelines/asthma/asthgdln.pdf. Accessed February 12, 2008.