1. Ataxia Centre; Department of Molecular Neuroscience; University College London; Institute of Neurology; London WC1N 3BG United Kingdom
2. National Xeroderma Pigmentosum Service; St John's Institute of Dermatology; Guy's and St Thomas’ Foundation Trust; London SE1 7EH United Kingdom
3. Neurology Department; Royal Free Hospital; London NW3 2QG United Kingdom
4. Reta Lila Weston Institute of Neurological Studies; University College London, Institute of Neurology; 1 Wakefield Street London WC1N 1PJ United Kingdom
5. Genome Damage and Stability Centre; University of Sussex; Falmer, Brighton BN1 9RQ United Kingdom