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Distribution of ginger randomized controlled trials (RCTs) based on quality assessment (QA) score: a bright color indicates a ‘high quality of evidence,’ whereas a dark color indicates the opposite. (a) In total, 43 RCTs were addressed to have a high quality of evidence, and (b) each important function was evaluated (CINV: chemotherapy-induced nausea and vomiting; NVP: nausea and vomiting of pregnancy; PONV: postoperative nausea and vomiting).
