Impact of a 12-week open-label placebo treatment on headache days in episodic and chronic migraine: a study protocol for a parallel-group, multicentre, randomised controlled trial.
Katharina SchmidtJulian Kleine-BorgmannDagny Holle-LeeCharly GaulUlrike BingelPublished in: BMJ open (2021)
German Clinical Trials Register (DRKS00021259).