1. Orthodontic Postgraduate Program, Gionorto Research Group, Faculty of Dentistry University of Antioquia Medellín Colombia
2. Department of Prosthodontics, Faculty of Medicine University of Würzburg Würzburg Germany
3. Department of Prosthodontics, Faculty of Dentistry National and Kapodistrian University of Athens Athens Greece
4. Department of Periodontology and Operative Dentistry, Faculty of Dentistry University Hospital Münster Münster Germany