title: Response to Regal's letter to the editor.
authors.affiliation: Service of Old Age Psychiatry, Department of Psychiatry, Centre Hospitalier Universitaire Vaudois and University of Lausanne, Lausanne, Switzerland.
authors.forename: Armin
authors.initials: A
authors.lastname: von Gunten
authors.affiliation: Department of Old Age Psychiatry, University Hospital of Psychiatry, University of Bern, Bern, Switzerland.
authors.forename: Urs Peter
authors.initials: UP
authors.lastname: Mosimann
authors.affiliation: Institute of Psychology, Geopolis, University of Lausanne, Lausanne, Switzerland.
authors.forename: Jean-Philippe
authors.initials: JP
authors.lastname: Antonietti
mesh_terms: D003693:Delirium / Q000175:diagnosis* / Q000453:epidemiology*; D018450:Disease Progression; D005260:Female; D006801:Humans; D008297:Male; D009735:Nursing Homes