Evaluation of serum amino acid profile in patients with advanced Parkinson's disease - Figura, Monika; Kusmierska, Katarzyna; Bucior, Ewelina; Szlufik, Stanislaw; Koziorowski, Dariusz; Jamrozik, Zygmunt; Friedman, Andrzej; Janik, Piotr (Parkinsonism & related disorders, 2016)