1. Departments of Orthodontics & Dentofacial Orthopedics and Oral & Craniofacial Sciences; School of Dentistry; University of Missouri-Kansas City; Kansas City MO USA
2. Department of Oral Diagnostic Sciences; School of Dental Medicine; University at Buffalo; Buffalo NY USA
3. Department of Statistics; University of Nebraska-Lincoln; Lincoln NE USA
4. Clinic of Masticatory Disorders; Removable Prosthodontics; Geriatric and Special Care Dentistry; Center of Dental Medicine; University of Zurich; Zurich Switzerland