1. Private Practice, Dresden, Germany.
2. Professor, Department of Orthodontics, Technical University of Dresden, Dresden, Germany.
3. Professor and Head, Department of Orthodontics, University Medical Center, Mainz, Germany.
4. Senior Consultant, Department of Oral and Maxillofacial Surgery, University Medical Center, Mainz, Germany.
5. Professor and Head, Department of Oral and Maxillofacial-Plastic Surgery, Ruhr University of Bochum, Bochum, Germany.
6. Professor and Head, Department of Orthodontics, University Medical Center, Freiburg, Germany.