1. Division of Orthodontics, University of Kentucky, Lexington, KY, USA
2. Department of Biostatistics, University of Kentucky, Lexington, KY, USA
3. Department of Orthodontics, Pontifical Catholic University of Minas Gerais, Belo Horizonte, Brazil
4. Department of Orthodontics, College of Dental Medicine, Medical University of South Carolina, Charleston, SC, USA