TY - JOUR T1 - The Implementation of Current UK Guidance for the Treatment of Co-Occurring Mental Health and Substance Use Conditions: A Mixed Methods Systematic Review and Thematic Synthesis JO - Journal of Dual Diagnosis UR - https://eprints.whiterose.ac.uk/id/eprint/245473 UR - https://doi.org/10.1080/15504263.2026.2726794 PY - 2026/09/10 AU - Swithenbank Z AU - Irizar P AU - Halsall L AU - Puddephatt J-A AU - Parkes P AU - O’Donnell A AU - Angus C AU - Drummond C AU - Jackson K AU - Goodwin L ED - DO - DOI: 10.1080/15504263.2026.2726794 PB - Informa UK Limited SP - 1 EP - 19 Y2 - 2026/09/15 ER -