Supportive criteria include the levodopa test, levodopa-induced dyskinesias, unilateral rest tremor, non-motor symptoms, and additional instrumental examinations such as the DAT (dopamine transporter) Scan (with a normal result serving as an exclusion criterion) and metaiodobenzylguanidine (MIBG) scintigraphy. Here, SLC6A3 is linked to Resting tremor.