[1] Ulm Univ Hosp, Dept Neurol, Ulm, Germany
[2] Ulm Univ Hosp, European Huntingtons Dis Network, Ulm, Germany
[3] Univ Rochester, Med Ctr, Dept Neurol, Rochester, NY 14642 USA
[4] Univ Lisbon, Fac Med, Clin Pharmacol Unit, Inst Mol Med, Lisbon, Portugal
[5] Univ Lucerne, Dept Hlth Sci & Hlth Policy, Luzern, Switzerland
[6] Swiss Parapleg Res Nottwil, Nottwil, Switzerland