1. Department of Preventive Medicine, Keck School of Medicine, University of Southern California, Los Angeles, CA, USA.
2. Methods in Epidemiologic, Clinical and Operations Research (MECOR) Program, American Thoracic Society, New York, NY, USA, and Asociación Latinoamericana de Tórax, Montevideo, Uruguay.
3. Divisão de Pneumologia, Instituto do Coração - InCor - Hospital das Clínicas, Faculdade de Medicina, Universidade de São Paulo, São Paulo, Brasil.