[1] Univ Med Ctr Nijmegen, Dept Human Genet, NL-6500 HB Nijmegen, Netherlands
[2] Rotterdam Eye Hosp, Rotterdam, Netherlands
[3] Inst Visually Handicapped Bartimeus, Zeist, Netherlands
[4] Univ Med Ctr Utrecht, Dept Med Genet, Utrecht, Netherlands
[5] McGill Univ, Montreal Childrens Hosp, Res Inst, McGill Ocular Genet Lab, Montreal, PQ H3H 1P3, Canada