Sudha M, Mukkadan J K, NavyaJith Jacob, Rajkumar D, Ashok Menon,. 2021. “Quantifiable Olfactory Dysfunction As a Diagnostic Marker in Parkinson’s Disease: A Study from Central Kerala”. Annals of the Romanian Society for Cell Biology 25 (6):193 -. https://annalsofrscb.ro/index.php/journal/article/view/5271.