[1] Catholic Univ Nijmegen, Dept Orthodont & Oral Biol, Med Ctr, NL-6500 HB Nijmegen, Netherlands
[2] Catholic Univ Nijmegen, Cleft Palate Craniofacial Unit, Med Ctr, NL-6500 HB Nijmegen, Netherlands
[3] Catholic Univ Nijmegen, Dept Prevent & Curat Dent, Med Ctr, NL-6500 HB Nijmegen, Netherlands
[4] Univ Manchester, Dept Oral Med & Surg, Manchester M13 9PL, Lancs, England