[1] Oslo Univ Hosp, Ctr Rare Disorders, Oslo, Norway
[2] Univ West England, Ctr Appearance Res, Bristol, Avon, England
[3] Univ Helsinki, Cent Hosp, Cleft Palate & Craniofacial Ctr, Dept Plast Surg, Helsinki, Finland
[4] Univ Copenhagen Hosp, Copenhagen Cleft Palate Ctr, Copenhagen, Denmark
[5] Statped Sorost, Dept Speech & Language Disorders, Oslo, Norway
[6] Sahlgrens Univ Hosp, Div Speech & Language Pathol, Gothenburg, Sweden
[7] Linkoping Univ Hosp, Maxillofacial Unit, Dept Dentofacial Orthoped, Linkoping, Sweden
[8] Karolinska Univ Hosp, Stockholm Craniofacial Team, Div Speech & Language Pathol, Stockholm, Sweden
[9] Statped Vest, Dept Speech & Language Disorders, Bergen, Norway
[10] Cleft Palate Ctr, Aarhus, Denmark
[11] Univ Manchester, Sch Dent, Manchester, Lancs, England
[12] Natl Hosp Norway, Oslo Univ Hosp, Dept Plast & Reconstruct Surg, Oslo, Norway