PTH and hyperparathyroidism: Despite the non-motor symptom screening with NMSQ identified various possible associations with 25(OH)D and PTH (i.e., memory performances, constipation, sexual function, and restless legs), only the link between PTH levels and restless legs maintained after selecting clinically relevant measures of interest (i.e., the presence of insufficiency or deficiency of vitamin D and hyperparathyroidism according to standardized criteria).