[1] Univ Turku, Dept Oral & Maxillofacial Surg, Turku, Finland
[2] Turku Univ Hosp, Dept Oral & Maxillofacial Dis, Turku, Finland
[3] Univ Helsinki, Children's Hosp, HUS Diagnostic Ctr, Dept Radiol, Helsinki, Finland
[4] Helsinki Univ Hosp, Helsinki, Finland
[5] Univ Helsinki, Dept Otorhinolaryngol Head & Neck Surg, Helsinki, Finland
[6] Univ Turku, Dept Community Dent, Turku, Finland
[7] Univ Helsinki, Dept Oral & Maxillofacial Dis, Helsinki, Finland