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APA Citation
Beck, T., Haasen, C., Verthein, U., Walcher, S., Schuler, C., Backmund, M., Ruckes, C., & Reimer, J. (n.d.). maintenance treatment for opioid dependence with slow‐release oral morphine: a randomized cross‐over, non‐inferiority study versus methadone. Addiction, 109, 617–626. http://access.bl.uk/ark:/81055/vdc_100024780900.0x000044