title: Response to letter to the editor.
authors.affiliation: Bispebjerg Frederiksberg Hospital, Coordinating Research Center/Syncope Unit/Department of Nuclear Medicine, Nordre Fasanvej 57, 2000 Frederiksberg, Denmark. Electronic address: louise.schouborg.brinth@regionh.dk.
authors.forename: Louise Schouborg
authors.initials: LS
authors.lastname: Brinth
authors.affiliation: Bispebjerg Frederiksberg Hospital, Coordinating Research Center/Syncope Unit/Department of Nuclear Medicine, Nordre Fasanvej 57, 2000 Frederiksberg, Denmark.
authors.forename: Jesper
authors.initials: J
authors.lastname: Mehlsen