Prevalence of headache in patients with Parkinson's disease and its association with the side of motor symptom onset. - Nunes, Jean; Costa Bergamaschi, E.; Freitas, F.; Diaz, A.; Queiroz, L.; Debona, R.; Prediger, R.; Linhares, M.; Lin, K.; Walz, Roger (Neurological Sciences, 2014)