Assessment of motor symptoms and functional impact in prodromal and early Huntington Disease by Vaccarino, A, Sills, T, Anderson, K, Biglan, K, Borowsky, B, Giuliano, J, Guttman, M, Ho, A, Kennard, C, Kupchak, P, Landwehrmeyer, G, Michell, A, Paulsen, J, Reilmann, R, Van Kammen, D, Warner, J, Evans, K