A multicentre randomised controlled trial assessing the costs and benefits of using structured information and analysis of women's preferences in the management of menorrhagia af Kennedy, ADM, Sculpher, M, Coulter, A, Dwyer, N, Rees, M, Horsley, S, Cowley, D, Kidson, C, Kirwin, C, Naish, C, Bidgood, K, Cullimore, J, Kerr-Wilson, R, Abrams, K, Stirrat, G