title: Reply.
authors.affiliation: Department of Orthodontics, School of Health Sciences, Faculty of Dentistry, Aristotle University of Thessaloniki Department of Training and Operations, 424 Military Hospital of Thessaloniki, Greece.
authors.forename: Vasileios F
authors.initials: VF
authors.lastname: Zymperdikas
authors.affiliation: Department of Orthodontics, School of Dentistry, University Medical Centre Regensburg, Departments of.
authors.forename: Vasiliki
authors.initials: V
authors.lastname: Koretsi
authors.affiliation: Orthodontics Oral Technology, University of Bonn, Germany.
authors.forename: Spyridon N
authors.initials: SN
authors.lastname: Papageorgiou
authors.affiliation: Department of Orthodontics, School of Health Sciences, Faculty of Dentistry, Aristotle University of Thessaloniki.
authors.forename: Moschos A
authors.initials: MA
authors.lastname: Papadopoulos