Additional file 1: of Effectiveness of the ‘Who’s Challenging Who’ support staff training intervention to improve attitudes and empathy towards adults with intellectual disability and challenging behaviours: study protocol for a cluster randomised controlled trial RandellElizabeth HastingsRichard McNamaraRachel KnightRoseanna GillespieDavid TaylorZachary 2017 Standard Protocol Items: Recommendations for Interventional Trials (SPIRIT) Checklist. (DOC 227 kb)