GBA1 and Parkinson disease: Comparing different countries,3, 4, 8, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26 the p.E326K variant is reported most frequently in the Netherlands (present study) and Scandinavian countries.20, 24 Table 2 compares the most common GBA1 variants and the p.D140H + p.E326K complex allele in large PD cohorts from single countries that performed full GBA1 ORF sequencing.