Brain responses to drug cues predict craving changes in abstinent heroin users: A preliminary study. 

Liu S, Wang S, Zhang M, Xu Y, Shao Z, Chen L, Yang W, Liu J, Yuan K. 

Neuroimage. 2021 May 15;237:118169. doi: 10.1016/j.neuroimage.2021.118169. Epub ahead of print. PMID: 34000396.

https://www.sciencedirect.com/science/article/pii/S1053811921004468