1. Postgraduate Student, Section of Orthodontics, School of Dentistry, University of California, Los Angeles, Calif.
2. Dental Student, School of Dentistry, University of California, Los Angeles, Calif.
3. Associate Professor, Department for Paediatric Dentistry and Orthodontics, Faculty for Dentistry, Semmelweis University, Budapest, Hungary.
4. Instructor, Section of Orthodontics, School of Dentistry, University of California, Los Angeles, Calif.
5. Assistant Professor, Section of Orthodontics, School of Dentistry, University of California, Los Angeles, Calif.