Parra-Medina, L.E., Álvarez-Cervera, F.J. and Góngora-Alfaro, J.L. 2022. Potential sources of bias in the studies of risk and protection factors associated with Parkinson’s Disease. Archivos de Neurociencias. 25, 2 (Jan. 2022), 6–18. DOI:https://doi.org/10.31157/an.v25i2.232.