1. a Dentist and PhD resident, Departments of Cariology and Orthodontics, The Sahlgrenska Academy at Gothenburg University, Gothenburg, Sweden
2. b Consultant, private practice, visiting faculty at King Saud University, Department of Orthodontics, Riyadh, Kingdom of Saudi Arabia
3. c Associate Professor and Clinical Director of Postgraduate Education, Department of Orthodontics, The Sahlgrenska Academy at Gothenburg University, Gothenburg, Sweden
4. d Professor and Chairman, Department of Cariology, The Sahlgrenska Academy at Gothenburg University, Gothenburg, Sweden