1. Federal University of Rio Grande do Sul; Graduate Program in Pulmonology; Porto Alegre RS Brazil
2. School of Medicine; Federal University of Rio Grande do Sul; Porto Alegre RS Brazil
3. Federal University of Santa Maria; Public Health Residency Program; Santa Maria RS Brazil
4. Department of Pulmonology; Hospital de Clínicas de Porto Alegre; Federal University of Rio Grande do Sul; Porto Alegre Brazil