Pressure Relieving Support Surfaces: a Randomised Evaluation 2 (PRESSURE 2): using photography for blinded central endpoint review oleh Elizabeth McGinnis, Isabelle L Smith, Howard Collier, Lyn Wilson, Susanne Coleman, Nikki Stubbs, Sarah Brown, Rachael Gilberts, Valerie Henderson, Kay Walker, E. Andrea Nelson, Jane Nixon, on behalf of the PRESSURE 2 Trial Group