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   Tatsuya Hisada et al, 2013, Biological and Pharmaceutical Bulletin CrossRef
2. ER/LA opioid REMS supplement
   Paul A. Sloan, MD et al, 2014, Journal of Opioid Management CrossRef
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   Takeshi Chiba et al, 2010, Palliative Care Research CrossRef
4. Conversion ratios: Why is it so challenging to construct opioid conversion tables?
   Mellar P. Davis et al, 2024, Journal of Opioid Management CrossRef