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For many patients, current treatments do not adequately resolve heartburn in nonerosive reflux disease (NERD).To compare vonoprazan and placebo with respect to the frequency and severity of heartburn in patients with NERD.This Phase III, double-blind, placebo-controlled, parallel-group, multicenter study included patients in Japan aged ≥20 years with Grade N or M NERD and recurrent acid reflux symptoms...