1. Clinic of Orthodontics and Pediatric Dentistry, Center of Dental Medicine University of Zurich Zurich Switzerland
2. ETEP (Etiology and Therapy of Periodontal Diseases) Research Group, Department of Periodontology, Faculty of Dentistry University Complutense Madrid Spain
3. Division of Orthodontics and Dentofacial Orthopedics, Eastman Institute for Oral Health University of Rochester Rochester New York USA
4. Department of Orthodontics, School of Dentistry National and Kapodistrian University of Athens Athens Greece
5. Department of Periodontology, School of Dentistry National and Kapodistrian University of Athens Athens Greece