[1] Mengel, D., Dams, J., Ziemek, J., Becker, J., Balzer-Geldsetzer, M., Hilker, R., Baudrexel, S., Kalbe, E., Schmidt, N., Witt, K., Liepelt-Scarfone, I., Graeber, S., Petrelli, A., Neuser, P., Schulte, C., Linse, K., Storch, A., Wittchen, H. -U., Riedel, O., Mollenhauer, B., Ebentheuer, J., Treniwalder, C., Klockgether, T., Spottke, A., Wuellner, U., Schulz, J. B., Reetz, K., Heber, I. A., Ramirez, A., and Dodel, R., “Apolipoprotein E epsilon 4 does not affect cognitive performance in patients with Parkinson's disease”, PARKINSONISM \& RELATED DISORDERS, vol. 29. ELSEVIER SCI LTD, Aug.-2016.