title: Response to letter to the editor.
authors.forename: Muhammad K
authors.initials: MK
authors.lastname: Rafiq
mesh_terms: D000690:Amyotrophic Lateral Sclerosis / Q000150:complications*; D001785:Blood Gas Monitoring, Transcutaneous / Q000379:methods*; D002245:Carbon Dioxide; D005260:Female; D006801:Humans; D008297:Male; D012131:Respiratory Insufficiency / Q000175:diagnosis* / Q000209:etiology*
chemical_list: D002245:Carbon Dioxide