[1] Univ Freiburg, Inst Human Genet & Anthropol, D-79106 Freiburg, Germany
[2] Univ Gottingen, Inst Human Genet, D-3400 Gottingen, Germany
[3] Our Ladys Hosp Sick Children, Natl Ctr Med Genet, Dublin, Ireland
[4] St Marys Hosp, Dept Clin Genet, Manchester M13 0JH, Lancs, England
[5] Northwick Pk Hosp & Clin Res Ctr, Kennedy Galton Ctr, Harrow HA1 3UJ, Middx, England
[6] Univ Gottingen, Dept Neuroophthalmol, D-3400 Gottingen, Germany
[7] UCL, Sch Med, Inst Child Hlth, London W1N 8AA, England
[8] Dokuz Eylul Univ, Dept Paediat, Div Genet, Izmir, Turkey
[9] Abant Izzet BAysal Univ, Sch Med, Med Biol & Genet Dept, Duzce, Turkey