Evaluating the implementation and impact of the HEart faiLure carer support Programme (HELP) in the United Kingdom: A study protocol for a multi-centre, mixed-method, implementation study - Gareth Thompson; Judy Bradley; Martin Dempster; Patrick Stark; Mike Clarke; Nicola Johnston; Lana Dixon; Patricia Campbell; Patrick Donnelly; Theresa McDonagh; Susan Piper; Yvonne Millerick; et al. (PLoS ONE, 2026)