It's in that spirit that we reassessed our list of the 25 most head-turning college campuses in the country, in the process switching out some otherwise deserving notables (sorry Columbia) for some even better looking, heretofore overlooked gems.
The Global Initiative for Chronic Obstructive Lung Disease (GOLD) defines COPD as follows: Chronic obstructive pulmonary disease (COPD) is a common, preventable, and treatable disease that is characterized by persistent respiratory symptoms and airflow limitation that is due to airway and/or alveolar abnormalities usually caused by significant exposure to noxious particles or gases.
GOLD Classification for COPD - version 2013. In 2013 the GOLD initiative published a new classification for COPD severity. Where the older versions only took lung values in account, GOLD 2013 also takes severity of symptoms and number of exacerbations into account. Aside from the classic GOLD 1, 2, 3 and 4 stages, the new classification distinguishes also stages A, B, C and D.