1. Department of Periodontology; Hebrew University-Hadassah Faculty of Dental Medicine; Jerusalem Israel
2. Department of Stomatology IV; Area of Orthodontics; Complutense University of Madrid; Madrid Spain
3. Department of Stomatology; Area of Periodontics; Complutense University of Madrid; Madrid Spain
4. Department of Prosthodontics; Hebrew University-Hadassah Faculty of Dental Medicine; Jerusalem Isreal