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**See the [Global Initiative for Chronic Obstructive Lung Disease (GOLD) website|http://www.goldcopd.com/] and more specifically the [guidelines|http://www.goldcopd.com/Guidelineitem.asp?l1=2&l2=1&intId=989]. |
**See the [Global Initiative for Chronic Obstructive Lung Disease (GOLD) website|http://www.goldcopd.com/]. |