Evaluating the antagonist effect of naltrexone implant via opioid challenge tests with escalating doses of hydromorphone injection in former heroin dependent patients - Qu, Wei; Wang, Xuyi; Dong, Chongyang; Zhang, Tao; Yin, Shugui; Sun, Zhijun; Wang, Shiqiang; Guo, Anni; Hao, Wei (Frontiers in Psychiatry, 2025)