MAOB and Parkinson disease: Of the 44 patients with PD, nine patients were treated with levodopa only; 15 patients were treated with levodopa and dopamine agonists (DA); and seven patients were treated with the combination of levodopa, DA, and monoamine oxidase type B inhibitors (MAOB-I) (For the combinations of anti-PD drugs in all patients, please see Supplementary Table 1).