Ogunrin, A., M. Komolafe, E. Sanya, C. Osubor, O. Ajose, A. Akande, and S. Mosaku. “Trace Metals in Patients With Parkinson’s Disease: A Multi-Center Case-Control Study of Nigerian Patients ”. Journal of Neurology and Epidemiology, vol. 1, no. 1, Apr. 2013, pp. 31-38, doi:10.12974/2309-6179.2013.01.01.4.