title: The authors reply.
authors.affiliation: Inter-Departmental Division of Critical Care Medicine, University Health Network, University of Toronto, ON, Canada; Respiratory and Critical Care Unit, Department of Specialist, Diagnostic and Experimental Medicine (DIMES) Sant'Orsola Malpighi Hospital, Alma Mater University, Bologna, Italy; Dipartimento di Anestesiologia e Rianimazione, Azienda Ospedaliera Città della Salute e della Scienza e di Torino, Università di Torino, Torino, Italy.
authors.forename: Lorenzo
authors.initials: L
authors.lastname: Del Sorbo
authors.forename: Stefano
authors.initials: S
authors.lastname: Nava
authors.forename: V Marco
authors.initials: VM
authors.lastname: Ranieri
mesh_terms: D006801:Humans; D006935:Hypercapnia / Q000628:therapy*; D063087:Noninvasive Ventilation / Q000379:methods*