1. Private practice, Boston, Mass.
2. Professor and Postgraduate Program Director, Department of Orthodontics, School of Dentistry, Virginia Commonwealth University, Richmond, Va.
3. Biostatistician and Assistant Professor, Department of Periodontics, School of Dentistry, Virginia Commonwealth University, Richmond, Va.
4. Norborne Muir Professor and Chair, Department of Orthodontics, School of Dentistry, Virginia Commonwealth University, Richmond, Va.