[1] Radboud Univ Nijmegen, Med Ctr, Dept Pediat, Nijmegen, Netherlands
[2] Radboud Univ Nijmegen, Med Ctr, Dept Human Genet, Nijmegen, Netherlands
[3] Univ Ghent, Ctr Med Genet, Ghent, Belgium
[4] Ghent Univ Hosp, Ghent, Belgium
[5] UCL Inst Ophthalmol, London, England
[6] Radboud Univ Nijmegen, Med Ctr, Donders Inst Brain Cognit & Behav, Nijmegen, Netherlands
[7] Radboud Univ Nijmegen, Med Ctr, Radboud Inst Mol Life Sci, Nijmegen, Netherlands