title: The authors reply.
authors.affiliation: Réanimation Médicale, AP-HP, Groupe Hospitalier Albert Chenevier-Henri Mondor, Créteil, France, and Servei de Pneumologia, Hospital Universitari de Bellvitge, L'Hospitalet de Llobregat, Barcelona, Spain; Réanimation Médicale, AP-HP, Groupe hospitalier Albert Chenevier-Henri Mondor, Créteil, France, INSERM Unité 922 Equipe 13, Créteil, France, Faculté de Médecine, Université Paris 12, Créteil, France, and Service de Soins Intensifs, Hôpitaux Universitaires de Genève, Geneva University, Geneva, Switzerland.
authors.forename: Ana
authors.initials: A
authors.lastname: Córdoba-Izquierdo
authors.forename: Laurent
authors.initials: L
authors.lastname: Brochard
mesh_terms: D005260:Female; D006801:Humans; D006935:Hypercapnia / Q000628:therapy*; D008297:Male; D012121:Respiration, Artificial; D012131:Respiratory Insufficiency / Q000628:therapy*; D012890:Sleep / Q000502:physiology*