Examining the uptake, retention, and effectiveness of a national online type 2 diabetes self-management intervention in England (Healthy Living): A retrospective cohort study - Salwa S. Zghebi; Sarah Cotterill; Antonia Marsden; Luke Paterson; Rachel A. Elliott; Brian McMillan; Martin K. Rutter; Evangelos Kontopantelis (PLoS ONE, 2026)