1 Department of Orthodontics, University of Homburg, Saar, Germany; Private Practice of Orthodontics in Trarbach, Germany. bludwig@kieferorthopaedie-mosel.
2 Private Practice of Orthodontics in Arco, Italy.
3 Postgraduate Orthodontic Program, University of Trieste, Trieste; Private Practice of Orthodontics in Arco, Italy.
4 Department of Medical, Surgical and Health Sciences, School of Dentistry, University of Trieste, Trieste, Italy.
5 Private Practice of Orthodontics in St. Johann, Austria..