[1] Publ Dent Hlth Competence Ctr Northern Norway TkN, Tromso, Norway
[2] UiT The Arctic Univ Norway, Fac Hlth Sci, Dept Clin Med, Res Grp Child & Adolescent Hlth, Tromso, Norway
[3] Univ Gothenburg, Inst Odontol, Dept Periodontol, Gothenburg, Sweden
[4] Univ Bergen, Dept Clin Dent, Bergen, Norway
[5] Univ Hosp North Norway, Dept Pediat, Tromso, Norway
[6] Univ Hosp North Norway, Dept Otorhinolaryngol, Div Oral & Maxillofacial Surg, Tromso, Norway
[7] UiT The Arctic Univ Norway, Dept Clin Dent, Tromso, Norway
[8] Univ Hosp North Norway, Sect Pediat Radiol, Tromso, Norway
[9] Ctr Oral Hlth Serv & Res TkMidt, Trondheim, Norway
[10] Norwegian Univ Sci & Technol NTNU, Dept Clin & Mol Med, Trondheim, Norway
[11] St Olavs Hosp, Dept Pediat, Trondheim, Norway
[12] Haukeland Hosp, Dept Pediat, Bergen, Norway