The journey of stage III and IV non-small cell lung cancer patients in the Brazilian private healthcare system: a retrospective study oleh Erica R. Cerqueira, Paula M. Batista, Milena F. Almeida, Maria A. C. Rego, Ana C. P. Ribeiro-Pereira, Fernando Alencar, Roberta A. Fernandes, Aknar F. C. Calabrich, Gustavo Schvartsman