Prodromal features of Parkinson's disease: Self‐reported symptoms versus clinically assessed signs. Issue 1 (13th November 2018) - Friederich, Anja; Flinspach, Aminah; Suenkel, Ulrike; Eschweiler, Gerhard W.; Greulich, Katharina; ,; Maetzler, Walter; Berg, Daniela; Heinzel, Sebastian