1. Global and regional mortality from 235 causes of death for 20 age groups in 1990 and 2010: a systematic analysis for the Global Burden of Disease Study 2010
2. Word Health OrganizationChronic obstructive pulmonary disease (COPD) fact sheet20172017-06-22http://www.who.int/mediacentre/factsheets/fs315/en/
3. Global Initiative for Chronic Obstructive Lung Disease (GOLD)Global strategy for the diagnosis, management, and prevention of chronic obstructive pulmonary disease (2017 report)2017-06-22http://goldcopd.org/gold-2017-global-strategy-diagnosis-management-prevention-copd/
4. International Primary Care Respiratory Group (IPCRG) Guidelines: Management of Chronic Obstructive Pulmonary Disease (COPD)