Asthma Rev JAMA 2017 - Asthma Rev NEJM 2017 - Severe Asthma COPD Rev Clev 2014 - COPD Rev Clev 2016 - COPD exacerbations GL GOLD 2017 - COPD (pocket) GL GOLD 2017 - COPD ILD Rev NEJM 2018 - Pulm fibrosis OHS Rev Chest 2016 - OHS management Spirometry Spirometry - Rev GOLD 2015