1. Centre for Molecular Medicine Therapeutics; University of British Columbia; Vancouver BC Canada
2. Division of Human Genetics; Department of Pathology; University of Cape Town; South Africa
3. Division of Human Genetics; School of Pathology; Faculty of Health Sciences; University of the Witwatersrand; Johannesburg South Africa
4. Medical Genetics Group; School of Medicine and Dentistry; University of Aberdeen; Aberdeen UK
5. Translational Laboratory in Genetic Medicine; Agency for Science, Technology and Research (A*STAR); Singapore
6. Department of Psychiatry; University of British Columbia; Vancouver BC Canada
7. Molecular Biology Group; Coriell Institute for Medical Research; Camden, New Jersey
8. Neurogenetics Research Center; Instituto Nacional de Ciencias Neurologicas; Lima Peru
9. IRCCS Casa Sollievo della Sofferenza Hospital; Huntington and Rare Diseases Unit (CSS-Mendel Rome); San Giovanni Rotondo Italy
10. Department of Genetics; School of Medicine; University of Pennsylvania; Philadelphia, Pennsylvania
11. Division of Human Genetics; National Health Laboratory Service and School of Pathology; Faculty of Health Sciences; University of the Witwatersrand; Johannesburg South Africa