Materials and methods
FRANKLIN
The current randomized, experimental, double-blind, placebo-controlled study was performed at the Department of Psychiatry and Neuroscience, Charité — Universitätsmedizin Berlin, Campus Benjamin Franklin. The local ethics committee of Charité —Universitätsmedizin Berlin approved the study protocol (EA4/162/18). Participants received all information at least 24 h in advance and signed written informed consent upon arrival in the laboratory. The start of every testing was set for 2 pm, to account for differences in cortisol levels due to the circadian rhythm into consideration [