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Research characteristics of the articles on OPMD research during 2006–2021 from Taiwan and mainland China. (A) The cloud graphs of the main keywords extracted from the included articles. (B) The ranks of risk factors and subtypes of OPMD. (C) The ranks of distinctive keywords. (D) The malignant transformation rate of the subtypes of OPMD extracted from the representative results of investigations. (E) The ranks of study designs and experiment methods.
