[1] Pontificia Univ Catolica Rio Grande do Sul, Hosp Sao Lucas, Porto Alegre, RS, Brazil
[2] Hosp Canc Mae Deus, Clin Oncol, Porto Alegre, RS, Brazil
[3] Pontificia Univ Catolica Rio Grande do Sul, Hosp Sao Lucas, Thorac Surg, Porto Alegre, RS, Brazil
[4] Inst Canc Hosp Sao Vicente de Paulo, Thorac Oncol, Passo Fundo, Brazil
[5] Pontificia Univ Catolica Rio Grande do Sul, Hosp Sao Lucas, Oncol, Porto Alegre, RS, Brazil
[6] Latin Amer Cooperat Oncol Grp, Porto Alegre, RS, Brazil