The Effects of an Individualized Smartphone-Based Exercise Program on Self-defined Motor Tasks in Parkinson Disease: Pilot Interventional Study - Gaßner, Heiko; Friedrich, Jana; Masuch, Alisa; Jukic, Jelena; Stallforth, Sabine; Regensburger, Martin; Marxreiter, Franz; Winkler, Jürgen; Klucken, Jochen (Friedrich-Alexander-Universität Erlangen-Nürnberg, 2022)