[1] UCL, Eastman Dent Inst, London WC1X 8LD, England
[2] Univ Ottawa, Ottawa, ON K1N 6N5, Canada
[3] Childrens Hosp Eastern Ontario, Div Genet, Ottawa, ON K1H 8L1, Canada
[4] Kings Coll London, Inst Psychiat, London WC2R 2LS, England
[5] Univ Amsterdam, Emma Childrens Hosp, Dept Pediat, NL-1012 WX Amsterdam, Netherlands
[6] Univ Amsterdam, Emma Childrens Hosp, Dept Clin Genet, NL-1012 WX Amsterdam, Netherlands
[7] Univ Cambridge, Comp Lab, Cambridge CB2 3QG, England
[8] Univ London St Georges Hosp, Sch Med, Dept Med Genet, London SW17 0RE, England
[9] Southrampton Univ Hosp Trust, Wessex Clin Genet Serv, Southampton, Hants, England
[10] Catholic Univ Louvain, Wolfson Inst Biomed Res, London, England
[11] Royal Coll Surgeons Ireland, Dept Psychiat, Dublin 2, Ireland
[12] UCL, Inst Child Hlth, London, England