[1] Pontificia Univ Catolica Rio Grande do Sul, Sch Med, Porto Alegre, RS, Brazil
[2] Pontificia Univ Catolica Rio Grande do Sul, Hosp Sao Lucas, Thorac Surg, Porto Alegre, RS, Brazil
[3] Pontificia Univ Catolica Rio Grande do Sul, Hosp Sao Lucas, Oncol, Porto Alegre, RS, Brazil
[4] Fed Univ Hlth Sci Porto Alegre, Postgrad Program Pathol, Porto Alegre, RS, Brazil
[5] Hosp Moinhos Vento, Pulmonol & Thorac Surg Serv, Porto Alegre, RS, Brazil