1. Genetic Medicine, Manchester Academic Health Science Centre; Central Manchester University Hospitals NHS Foundation Trust; Manchester UK
2. Centre for Human and Clinical Genetics; Leiden University Medical Centre; Leiden The Netherlands
3. Istituto di Farmacologia Traslazionale del CNR; Rome Italy
4. Department of Human Genetics, University of Leuven; Leuven Belgium
5. International Huntington Association; c/o Huntington's WA (inc) The Niche; 11 Aberdare Road Nedlands 6009 Western Australia Australia
6. Neurological Department; Fundación Jiménez Díaz Avda; Reyes Católicos 2 28040 Madrid Spain
7. Department of Neurology Leiden; University Medical Centre; PO Box 9600, 2300RC Leiden The Netherlands