Craving mediates the association between momentary pain and illicit opioid use during treatment for opioid‐use disorder: an ecological momentary assessment study. - Mun, Chung Jung; Finan, Patrick H.; Epstein, David H.; Kowalczyk, William J.; Agage, Daniel; Letzen, Janelle E.; Phillips, Karran A.; Preston, Kenzie L. (Addiction, 2021)