1. Department of Orthodontics and Dentofacial OrthopedicsTufts University School of Dental Medicine Boston Massachusetts
2. Department of Public Health and Community ServiceDivision of Biostatistics and Experimental DesignTufts University School of Dental Medicine Boston Massachusetts
3. Department of Orthodontics and Pediatric DentistryUZB – University School of Dental MedicineUniversity of Basel Basel Switzerland