Outcomes of ECMO support with polypropylene membrane during pandemic times: a retrospective cohort study oleh Natalia Valenzuela-Faccini, Claudia Poveda-Henao, Catalina Flórez-Navas, Michel Pérez-Garzón, Natalia Boada-Becerra, Mario Mercado-Diaz, Patricia Salcedo, Henry Robayo-Amortegui