Letter to the Editor High-flow nasal oxygen is not an oxygen therapy device S. Díaz-Lobato, , J.M. Alonso, J.M. Carratalá, S. MayoralasHospital Ramón y Cajal, Neumologia, Carretera de Colmenar Viejo, Km 9,100, 28034 Madrid, Spain Received 21 July 2015, Accepted 22 October 2015