Wegwarth, O., Spies, C., Schulte, E., Meerpohl, J. J., Schmucker, C., Nury, E., et al. (2020). Experiencing the risk of overutilising opioids among patients with chronic non-cancer pain in ambulatory care (ERONA): The protocol of an exploratory, randomised controlled trial. BMJ Open, 10: e037642. doi:10.1136/bmjopen-2020-037642.