The effectiveness of a primary care based collaborative care model to improve quality of life in people with severe mental illness: the PARTNERS2 cluster randomised controlled tria... by Byng, R, Creanor, S, Jones, B, Hosking, J, Plappert, H, Bevan, S, Britten, N, Clark, M, Davies, L, Frost, J, Gask, L, Gibbons, B, Gibson, J, Hardy, P, Hobson-Merrett, C, Huxley, P, Jeffery, A, Marwaha, S, Rawcliffe, T, Siobhan, R, Richards, D, Sayers, R, Williams, L, Pinfold, V, Birchwood, M