1 Department of Neurology, Ulm University Hospital, Ulm, Germany.
2 Department of Pharmaceutical Organic Chemistry, Assiut University, Assiut, Egypt.
3 UCL Huntington's disease Centre, UCL Queen Square Institute of Neurology and National Hospital for Neurology and Neurosurgery, Queen Square, London, UK.
4 Swiss Huntington Centre, Neurozentrum, Siloah AG, Gumligen, Switzerland.
5 University Hospital of Old Age Psychiatry and Psychotherapy, Bern University, Bern, Switzerland.