Comparison of Montreal cognitive assessment and Mattis dementia rating scale in the preoperative evaluation of subthalamic stimulation in Parkinson's disease. oleh Eileen Gülke, Mohammad Alsalem, Maja Kirsten, Eik Vettorazzi, Chi-Un Choe, Ute Hidding, Simone Zittel-Dirks, Carsten Buhmann, Miriam Schaper, Alessandro Gulberti, Christian K E Moll, Wolfgang Hamel, Johannes Koeppen, Christian Gerloff, Monika Pötter-Nerger