The efficacy of sodium benzoate as an adjunctive treatment in early psychosis - CADENCE-BZ: study protocol for a randomized controlled trial oleh Alex Ryan, Andrea Baker, Frances Dark, Sharon Foley, Anne Gordon, Sean Hatherill, Stephen Stathis, Sukanta Saha, George Bruxner, Martin Beckman, Drew Richardson, Michael Berk, Olivia Dean, John McGrath, Cadence Working Group, James Scott