GBA1 and Parkinson disease: Specifically, PD-GBA+ patients were more likely to be right-lateralized (GBA+: 15/18, 83 % vs GBA-: 34/68, 50 %) and suffered higher rates of FOG (GBA+: 9/18, 50 % vs GBA-: 7/68, 10 %) and RBD symptoms (GBA+: 8/18, 44 % vs GBA-: 10/68, 14 %) than PD-GBA- (Fig. 1).