[1] Aarhus Univ, Sect Orthodont, Vennelyst Blvd 9-11, DK-8000 Aarhus C, Denmark
[2] Specialist Oral Hlth Ctr Western Norway, Stavanger, Rogaland, Norway
[3] Aarhus Univ Hosp, Dept Oral & Maxillofacial Surg, Aarhus, Denmark
[4] Aarhus Univ Hosp, Dept Pediat, Aarhus N, Denmark