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A navel stone mimicking a urachal sinus
  1. Hidehiko Nakano1,
  2. Takashi Watari1,
  3. Yu Suganami1,
  4. Yasuharu Tokuda2
  1. 1Shonan Kamakura General Hospital, Kamakura City, Kanagawa, Japan
  2. 2General Internal Medicine, Tsukuba University, Mito, Ibaraki, Japan
  1. Correspondence to Professor Yasuharu Tokuda, yasuharu.tokuda{at}

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