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Funnel plot for publication bias in the studies investigating NMSC risk in PD patients: (a) all studies; (b) BCC; (c) squamous cell carcinoma (SCC); (d) females; (e) males; (f) NMSCs diagnosed before PD diagnosis; (g) NMSCs diagnosed after PD diagnosis; (h) Prospective studies; (i) Retrospective studies.
