[1] Univ Birmingham, Dept Med & Mol Genet, Birmingham B15 2TT, W Midlands, England
[2] Univ Birmingham, Ctr Rare Dis & Personalised Med, Birmingham B15 2TT, W Midlands, England
[3] Birmingham Womens Hosp Edgbaston, W Midlands Reg Genet Serv, Birmingham, W Midlands, England
[4] Guys Hosp, Dept Clin Genet, London, England
[5] Churchill Hosp, Dept Clin Genet, Oxford, England
[6] St Georges Univ London, Dept Med Genet, London, England
[7] Belfast City Hosp, Dept Med Genet, Belfast BT9 7AD, Antrim, North Ireland