title: Reply.
authors.affiliation: The Robinson Research Institute, The University of Adelaide, Adelaide, South Australia. Electronic address: alastair.maclennan@adelaide.edu.au.
authors.forename: Alastair Harvey
authors.initials: AH
authors.lastname: Maclennan
authors.affiliation: Department of Paediatric Neurology, Adelaide Women's & Children's Hospital, Adelaide, South Australia.
authors.forename: Suzanna C
authors.initials: SC
authors.lastname: Thompson
authors.affiliation: Neurogenetics Research Program, School of Paediatrics and reproductive Health, The University of Adelaide, Adelaide, South Australia.
authors.forename: Jozef
authors.initials: J
authors.lastname: Gecz