Steroids or pentoxifylline for alcoholic hepatitis (STOPAH): study protocol for a randomised controlled trial - Forrest, E; Mellor, J; Stanton, L; Bowers, M; Ryder, P; Austin, A; Day, C; Gleeson, D; O'Grady, J; Masson, S; McCune, A; Patch, D; et al. (TRIALS, 2013)