Efficacy of ketamine mouthwash in the management of oral and pharyngeal toxicity associated with head and neck chemoradiotherapy: protocol for a phase II, Simon’s two-stage trial by Nagashree Seetharamu, Diana Martins-Welch, Nina Kohn, Joseph Herman, Daniel Koffler, Jacob Eckstein, Maged Ghaly, Louis Potters, Douglas Frank, Kevin Sullivan, Bhupesh Parashar

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