Efficacy and safety of pramipexole extended-release for advanced Parkinson´s disease - Schapira, A; Barone, P; Hauser, RA; Mizuno, Y; Poewe, W; Rascol, O; Busse, M; Juhel, N; in the name of the pramipexole ER study group (Poster WE-199, 13th Annual International Congress of Parkinson´s Disease and Movement Disorders, 2009)