Lung function six months after severe COVID-19: Does time, in fact, heal all wounds? Daniel Cruz Bretas; Arnaldo Santos Leite; Eliane Viana Mancuzo; Tarciane Aline Prata; Bruno Horta Andrade; Jacqueline das Graças Ferreira Oliveira; Aline Priscila Batista; George Luiz Lins Machado-Coelho; Valéria Maria Augusto; Carolina Coimbra Marinho;