Criner RN, Labaki WW, Regan EA, Bon JM, Soler X, Bhatt SP, Murray S, Hokanson JE, Silverman EK, Crapo JD, Curtis JL, Martinez FJ, Make BJ, Han MK, Martinez CH. Mortality and Exacerbations by Global Initiative for Chronic Obstructive Lung Disease Groups ABCD: 2011 Versus 2017 in the COPDGene? Cohort. Chronic Obstr Pulm Dis. 2019 Jan 10; 6(1):64-73.