Can brief telephone interventions reduce caregiver burden and depression in caregivers of people with cognitive impairment? - long-term results of the German day-care study (RCT) - Donath, Carolin; Luttenberger, Katharina; Graessel, Elmar; Scheel, Jennifer; Pendergrass, Anna; Behrndt, Elisa-Marie (Friedrich-Alexander-Universität Erlangen-Nürnberg, 2019)