1. a Lecturer, Department of Preventive and Community Dentistry, University of Athens Dental School, Athens, Greece
2. b Lecturer, Department of Pediatric Dentistry, University of Athens Dental School, Athens, Greece
3. c Research Scientist, Department of Orthodontics, University of Athens Dental School, Athens, Greece
4. d Staff Scientist, Department of Periodontology, University of Athens Dental School, Athens, Greece
5. e Associate Professor, Department of Periodontology, University of Athens Dental School, Athens, Greece