Acknowledgements

All authors developed the overall idea of the study. TK and AKB planned the specific operationalisation of the study. TK analysed the data and wrote the draft of the manuscript, supervised by IK and AKB. All co-authors reviewed the manuscript and provided critical feedback on it.
We are very grateful to Lea Balthasar and Valentina Riehl for their important work in the conduction of the study. In addition, we would like to thank the “Adler Apotheke”, the local pharmacy in Landau, Germany, for their support in ordering the placebos used in the present study.