Corrigendum to: The Beneficial Effects of Computer-Based Cognitive Training in Parkinson's Disease: A Systematic Review. (23rd July 2020) - Nousia, Anastasia; Martzoukou, Maria; Tsouris, Zisis; Siokas, Vasileios; Aloizou, Athina-Maria; Liampas, Ioannis; Nasios, Grigorios; Dardiotis, Efthimios