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Sewell, Berni, Emma Davies, Mari Jones, Ceri Phillips, and Jaynie Rance. "Examining the Burden of Opioid Prescribing for Non-cancer Pain Considering Socio-economic Differences, in Wales. A Retrospective Database Study Examining Trends between 2005 – 2015." MedRxiv 2019.

Sewell, Berni, et al. "Examining the Burden of Opioid Prescribing for Non-cancer Pain Considering Socio-economic Differences, in Wales. A Retrospective Database Study Examining Trends between 2005 – 2015." MedRxiv 2019.