Study to Measure Cerebrospinal Fluid Mutant Huntingtin Protein in Participants With Early Manifest Stage I or Stage II Huntington's Disease

Charité - Universitätsmedizin Berlin, Campus Charité Mitte; Klinik für Psychiatrie und Psychotherapi, Berlin

Georgetown University; Research Division, Psychiatry, Washington D.C.

John Hopkins University School of Medicine, Baltimore

St. Josef and St. Elisabeth gGmbH ; St. Josef Hospital Bochum; Neurologisches Forschungszentrum, Bochum

Hereditary Neurological Disease Centre (HNDC), Wichita

The University of Texas Health Science Center at Houston; McGovern Medical School, Houston

CenExel Rocky Mountain Clinical Research, LLC, Englewood

Universitätsklinikum Ulm; Klinik für Neurologie, Ulm

Columbia University, New York

The University of British Columbia; The Centre for Huntington Disease, Vancouver

Centre for Movement Disorders (Neuropharm Consulting Inc.), Markham

NIHR Welcome Trust Birmingham CRF - University Hospitals Birmingham; Department of Neuropsychiatry, Birmingham

Cardiff University School of Medicine; Institute of Psychological Medicine Clinical Neurosciences, Cardiff

National Hospital For Neurology and Neurosurgery, London

Central Manchester University Hospitals NHS Foundation Trust; Manchester Centre for Genomic Medicine, Manchester