https://pubmed.ncbi.nlm.nih.gov/15293269/?dopt=Abstract
Idiopathic hyposmia as a preclinical sign of Parkinson's disease
Olfactory dysfunction is an early and common symptom in Parkinson's disease (PD). In an effort to determine whether otherwise unexplained (idiopathic)...
as aidiopathicpreclinicalsignparkinson