Antonio M Esquinas1, Raffaele Scala, Claudio Rabec. 1. Intensive Care Unit and Non-Invasive Ventilation Unit, Hospital Morales Meseguer, Murcia, Spain; Respiratory Ward and Respiratory Intensive Care Unit, San Donato Hospital, Arezzo, Italy; Service de Pneumologie et Réanimation Respiratoire, Centre Hospitalier et Universitaire de Dijon, Dijon, France.