CP and Parkinson disease: The current results showed that the percentage of CP + 2P was significantly decreased in the PD group compared with the sham group at 4 weeks (sham group, 0.79 ± 0.09; PD group, 0.30 ± 0.06; P = 0.0001), and 6 weeks after 6-OHDA injections (sham group, 0.76 ± 0.08; PD group, 0.27 ± 0.06; P = 0.001).