Primary syphilis with a tongue ulcer mimicking tongue cancer: a case report by Chonji Fukumoto, Manabu Zama, Toshiki Hyodo, Ryo Shiraishi, Ryouta Kamimura, Shuma Yagisawa, Tomonori Hasegawa, Yuske Komiyama, Sayaka Izumi, Takahiro Wakui, Hitoshi Kawamata

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