title: Response to the letter from dr bertini.
authors.forename: Elia
authors.initials: E
authors.lastname: De Maria
authors.forename: Mauro
authors.initials: M
authors.lastname: Biffi
authors.forename: Giuseppe
authors.initials: G
authors.lastname: Boriani
mesh_terms: D058406:Cardiac Resynchronization Therapy / Q000379:methods*; D017147:Defibrillators, Implantable; D004569:Electroencephalography / Q000379:methods*; D006333:Heart Failure / Q000175:diagnosis* / Q000517:prevention & control*; D006801:Humans; D008297:Male