title: Changing QRS morphology: what is the mechanism?
authors.affiliation: Department of Pacemaker and Electrophysiology, Rajaie Cardiovascular Medical and Research Center, School of Medicine, Iran University of Medical Sciences, Tehran, Iran. majid.haghjoo@gmail.com
authors.forename: Majid
authors.initials: M
authors.lastname: Haghjoo
authors.forename: Arash
authors.initials: A
authors.lastname: Arya
authors.forename: Mohammad Reza
authors.initials: MR
authors.lastname: Dehghani
authors.forename: Mohammad Ali
authors.initials: MA
authors.lastname: Sadr-Ameli