LRRK2 and Parkinson disease: 87 • LRRK2-PD patients with DBS surgery: 13 • LRRK2-PD patients without DBS surgery: 74Ad hoc analysis comparing the effect of DBS surgery between LRRK2-PD and idiopathic PD patients: • LRRK2-DBS group: 9 • iPD-DBS group: 14