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Serkan Kirbas, Aynur Kirbas, Ahmet Tufekci, Medine Cumhur Cure, Sevim Cakmak, Tarkan Yazici, Erkan Cure. "Serum levels of homocysteine, asymmetric dimethylarginine and nitric oxide in patients with Parkinson's disease." Acta Clinica Belgica (2016) 71-75