Analysis of the epsilon-sarcoglycan gene in familial and sporadic myoclonus-dystonia: evidence for genetic heterogeneity. Dahkki Valente, E, Misbahuddin, A, Brancati, F, Placzek, MR, Garavaglia, B, Salvi, S, Nemeth, A, Shaw-Smith, C, Nardocci, N, Bentivoglio, A, Berardelli, A, Eleopra, R, Dallapiccola, B, Warner, T