Morten Godtfredsen Laursen1, Mette Rylev2, Birte Melsen3. 1. Section of Orthodontics, Department of Dentistry, Faculty of Health Sciences, Aarhus University, Vennelyst Blvd. 9, DK-8000 Aarhus C, Denmark; Private Practice of Orthodontics in Aarhus. morten.godtfredsen.laursen@odont.au.dk. 2. Department of Dentistry, Faculty of Health Sciences, Aarhus University, Vennelyst Blvd. 9, DK-8000 Aarhus C, Denmark; Private Practice of Dentistry in Aarhus. 3. Section of Orthodontics, Department of Dentistry, Faculty of Health Sciences, Aarhus University, Vennelyst Blvd. 9, DK-8000 Aarhus C, Denmark; Journal of Clinical Orthodontics; Medizinische Hochschule, Hanover, Germany; Private Practice of Orthodontics in Lubeck, Germany.