title: The authors reply.
authors.affiliation: Interdepartmental Division of Critical Care Medicine, University Health Network, University of Toronto, Toronto, ON, Canada Respiratory and Critical Care Unit, Department of Specialist, Diagnostic and Experimental Medicine, 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*