[1] Univ Leeds, Sch Dent, Leeds, W Yorkshire, England
[2] Community Dent Serv Bradford Dist Care NHS Trust, Leeds, W Yorkshire, England
[3] Univ Valparaiso, Dept Pediat Dent, Fac Dent, Valparaiso, Chile
[4] Univ Dublin, Dublin Dent Univ Hosp, Trinity Coll Dublin, Paediat Dent, Dublin, Ireland
[5] Univ Western Australia, UWA Dent Sch, Nedlands, WA, Australia
[6] Karolinska Inst, Div Orthodont & Pediat Dent, Dept Dent Med, Huddinge, Sweden
[7] Ctr Pediat Oral Hlth Res, Stockholm, Sweden
[8] Univ N Carolina, Adams Sch Dent, Chapel Hill, NC 27515 USA
[9] Univ Washington, Dept Pediat Dent, Seattle, WA 98195 USA
[10] Seattle Childrens Hosp, Seattle, WA USA
[11] Copenhagen Univ Hosp, Resource Ctr Rare Oral Dis, Copenhagen, Denmark
[12] Univ Maryland, Sch Dent, Div Endodont, UMB, Baltimore, MD 21201 USA
[13] Univ Copenhagen Hosp, Rigshosp, Resource Ctr Rare Oral Dis, Dept Oral & Maxillofacial Surg, Copenhagen, Denmark
[14] Hacettepe Univ, Dept Pediat Dent, Fac Dent, Ankara, Turkey
[15] Univ Sydney, Fac Med & Hlth, Sydney, NSW, Australia
[16] Univ Queensland, Sch Dent, St Lucia, Qld, Australia
[17] Obafemi Awolowo Univ, Coll Hlth Sci, Fac Dent, Ife, Nigeria
[18] Univ Alberta, Fac Med & Dent, Edmonton, AB, Canada