Recurrent aphthous stomatitis may be a precursor or risk factor for specific cancers: A case‐control frequency‐matched study by Lei Qin, Yi‐Wei Kao, Yueh‐Lung Lin, Bou‐Yue Peng, Win‐Ping Deng, Tsung‐Ming Chen, Kuan‐Chou Lin, Kevin Sheng‐Po Yuan, Alexander T. H. Wu, Ben‐Chang Shia, Szu‐Yuan Wu

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