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
O Wegwarth,
C Spies,
E Schulte,
J J Meerpohl,
C Schmucker,
E Nury, D Brockmann,
N Donner-Banzhoff,
S Wind,
E Goebel,
W-D Ludwig,
R Hertwig
