Effect of spontaneous breathing on ventilator-free days in critically ill patients—an analysis of patients in a large observational cohort

Aline Mela Dos Reis, Thais Dias Midega, Rodrigo Octavio Deliberato, Alistair EW Johnson, Lucas Bulgarelli, Thiago Domingos Correa, Leo Anthony Celi, Paolo Pelosi, Marcelo Gama de Abreu, Marcus J. Schultz, Ary Serpa Neto, for the PROVE Network investigators