1. Department of Orthodontics and Department of Periodontics School of Dental Medicine, University of Pennsylvania, Philadelphia, PA, USA
2. Director of Postdoctoral Periodontics-Orthodontics Program, Department of Orthodontics, School of Dental Medicine, University of Pennsylvania, Philadelphia, PA, USA
3. Director of Postdoctoral Orthodontics Program, Department of Orthodontics, School of Dental Medicine, University of Pennsylvania, Philadelphia, PA, USA