“…Stemming from a progressive loss of dopaminergic neurons in the substantia nigra, motor symptoms mainly encompass bradykinesia, rigidity, and tremor (Damier, Hirsch, Agid, & Graybiel, 1999). Frequent additional nonmotor symptoms include depression, anxiety, apathy, (hypo‐)mania, dementia, psychosis, and impulse control disorder (Callesen, Weintraub, Damholdt, & Moller, 2014; van der Hoek et al., 2011; Maier et al., 2014; Reijnders, Ehrt, Weber, Aarsland, & Leentjens, 2008; Richard, 2007; Riedel et al., 2008; Sagna, Gallo, & Pontone, 2014; Starkstein, Brockman, & Hayhow, 2012). Together with motor symptoms (Appleman, Stavitsky, & Cronin‐Golomb, 2011; Hechtner et al., 2014; Weintraub et al., 2010), nonmotor symptoms can severely affect patients′ health‐related quality of life (Montel, Bonnet, & Bungener, 2009; Shearer, Green, Counsell, & Zajicek, 2012; for reviews see Den Oudsten, Van Heck, & De Vries, 2007; van Uem et al., 2016).…”