1. Methods in Epidemiologic, Clinical, and Operations Research-MECOR-program, American Thoracic Society/Asociación Latinoamericana del Tórax, Montevideo, Uruguay.
2. Department of Medicine, Division of Gastroenterology, University of Ottawa, Ottawa, ON, Canada
3. Divisão de Pneumologia, Instituto do Coração, Hospital das Clínicas, Faculdade de Medicina, Universidade de São Paulo, São Paulo (SP) Brasil.
4. Department of Preventive Medicine, Keck School of Medicine, University of Southern California, Los Angeles, CA, USA.