1. Departments of Psychiatry; University of Iowa; Iowa City Iowa USA
2. Departments of Biostatistics; University of Iowa; Iowa City Iowa USA
3. Department of Neurodegenerative Disease, UCL Huntington's Disease Centre; University College London Institute of Neurology; London United Kingdom
4. CHDI Management/CHDI Foundation; Princeton New Jersey USA
5. Department of Neurology; University of Ulm; Ulm Germany
6. Departments of Psychology; University of Iowa; Iowa City Iowa USA
7. Departments of Neurology; University of Iowa; Iowa City Iowa USA
8. Laboratory of Clinical Pharmacology and Therapeutics; University of Lisbon; Lisbon Portugal