University of Pennsylvania - Division of Neurology, Reata Pharmaceuticals, University of Melbourne - Victorian Clinical Genetics Services, University of Florida - Department of Neurology, Ohio State University (OSU) - Department of Neurology, Medical University of Innsbruck - Department of Neurology, Medical University of Innsbruck - Department of Neurology, Fondazione IRCCS Istituto Neurologico ‘Carlo Besta’ - Unit of Medical Genetics and Neurogenetics, University of Iowa - Department of Neurology, Government of the United Kingdom - University College London Hospital, Emory University - Department of Neurology, University of South Florida - Ataxia Research Center, University of California, Los Angeles (UCLA) - Department of Neurology, Reata Pharmaceuticals, Reata Pharmaceuticals and Reata Pharmaceuticals