title: Reply to Letter to the Editor.
authors.affiliation: Signal Processing Applications Group, Universidad Politécnica de Madrid, Avenida Complutense, 30, 28040 Madrid, Spain. Electronic address: ana.montero@gaps.ssr.upm.es.
authors.forename: Ana
authors.initials: A
authors.lastname: Montero Benavides
mesh_terms: D006801:Humans; D020181:Sleep Apnea, Obstructive