Effects of Home-Based Working Memory Training on Visuo-Spatial Working Memory in Parkinson’s Disease: A Randomized Controlled Trial oleh Kathrin Giehl, Anja Ophey, Paul Reker, Sarah Rehberg, Jochen Hammes, Michael T Barbe, Nahid Zokaei, Carsten Eggers, Masud Husain, Elke Kalbe, Thilo van Eimeren