A group-based behavioural intervention for weight management (PROGROUP) versus usual care in adults with severe obesity: a feasibility randomised controlled trial protocol oleh Dawn Swancutt, Mark Tarrant, Wendy Ingram, Sarah Baldrey, Lorna Burns, Richard Byng, Raff Calitri, Siobhan Creanor, Sarah Dean, Lucy Evans, Laura Gill, Elizabeth Goodwin, Lily Hawkins, Chris Hayward, Sarah Hind, Laura Hollands, Joanne Hosking, Jenny Lloyd, Shokraneh Moghadam, Helen Neilens, Mary O’Kane, Steve Perry, Rod Sheaff, Anne Spencer, Adrian Taylor, Thomas Ward, Ross Watkins, John Wilding, Jonathan Pinkney