1 Aarhus University, and Orthodontist, Section of Orthodontics, Department of Odontology and Oral Health, Aarhus University, Aarhus, Denmark; pstoustrup@odont.au.dk.
2 University of Calgary, and Pediatric Rheumatologist, Division of Rheumatology, Department of Paediatrics, Alberta Children's Hospital, Calgary, Alberta, Canada.
3 Harvard School of Dental Medicine and Harvard Medical School, and Oral and Maxillofacial Surgeon, Department of Plastic and Oral Surgery, Boston Children's Hospital, Boston, Massachusetts, USA.