Dyskinesias following neural transplantation in Parkinson’s disease - Hagell, P; Piccini, P; Bjorklund, A; Brundin, P; Rehncrona, S; Widner, H; Crabb, L; Pavese, N; Oertel, WH; Quinn, N; Brooks, DJ; Lindvall, O (Nat Neurosci, 2002)