Eighth International Chorea–Acanthocytosis Symposium: summary of workshop discussion and action Points by Pappas, S, Bonifacino, J, Danek, A, Dauer, W, De, M, De Franceschi, L, Dipaolo, G, Fuller, R, Haucke, V, Hermann, A, Kornmann, B, Landwehrmeyer, B, Levin, J, Neiman, A, Rudnicki, D, Sibon, O, Velayos Baeza, A, Vonk, J, Walker, R, Weisman, L, Albin, R