GBA1 and Lewy body dementia: For the GBA gene, we identified four variants: three have been already associated with PD [28,29,30], while the other with Lewy-body dementia [31]; of note, all these variants were identified as “DM.” Regarding the LRRK2 gene, we identified three variants as “DM” associated with PD [38,41,46], whereas six variants were detected as “DM?” associated with PD [39,40,42,43,44,45].