Evaluating a volunteer ‘Health Champions’ intervention supporting people with severe mental illness to manage their physical health: feasibility hybrid randomised controlled trial... oleh Julie Williams, Ray McGrath, Karen Ang, Ioannis Bakolis, Andy Healey, Jorge Arias de la Torre, Isabel Mdudu, Fiona Gaughran, Euan Sadler, Mariana Pinto da Costa, Errol Green, Natalia Stepan, Gracie Tredget, Zarnie Khadjesari, Sean Cross, Nick Sevdalis