Fig. 1From: Genetic heterogeneity on sleep disorders in Parkinson’s disease: a systematic review and meta-analysisFlowchart of the literature search according to Preferred Reporting Items for Systematic Review and Meta-Analyses (PRISMA). PD Parkinson’s disease, GBA glucocerebrosidase gene, LRRK2 Leucine-rich repeat kinase 2 gene, PRKN parkin geneBack to article page