GBA1 and Parkinson disease: Body-first PD was enriched for <i>GBA1</i> carriers (12.3% vs. 6.7%, <i>p</i> = 0.004, q = 0.021) and had less <i>LRRK2</i> carriers (7.9% vs. 15.0%, <i>p</i> = 0.002, q = 0.013).