Quantitative computed tomography phenotypes, spirometric parameters, and episodes of exacerbation in heavy smokers: An analysis from South America. - Barros, Marcelo Cardoso; Hochhegger, Bruno; Altmayer, Stephan; Watte, Guilherme; Zanon, Matheus; Sartori, Ana Paula; Cavalet Blanco, Daniela; Pacini, Gabriel Sartori; Chatkin, Jose Miguel (PLoS ONE, 2018)