REPORT FROM THE 13TH CONGRESS OF THE EUROPEAN FEDERATION OF NEUROLOGICAL SOCIETIES (EFNS), FLORENCE, ITALY, SEPTEMBER 12-15, 2009 – One-quarter of PD patients develop L-dopa-induced dyskinesias, according to the interim analysis of patients in the COPARK (Cohorte nationale de patients atteints de maladie de Parkinson)/PARKMIP (Midi-Pyrénées region) trial (Perez-Lloret et al. EFNS 2009). L-dopa-induced dyskinesia was defined as UPDRS IV (item 32) ≥ 1.