Longitudinal multi-level biomarker analysis of BDNF in major depression and bipolar disorder - Schröter, Katrin; Brum, Murielle; Brunkhorst-Kanaan, Nathalie; Tole, Franziska; Ziegler, Christiane; Domschke, Katharina; Reif, Andreas; Kittel-Schneider, Sarah (European archives of psychiatry and clinical neuroscience, 2020)