GBA1 and Parkinson disease: We ran a stratified analysis based on the carrier status in LRRK2, GBA, and SMPD1, as a high percentage of our PD cohort carry risk alleles in these 3 genes (35.1%, 388/1106), and these carrier-patients may mask the effect of the hexanucleotide repeat length on PD-risk in non-carrier patients.