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2. Sister Mary Joseph's nodule and its relationship to diagnosis of carcinoma of the umbilicus;Key;Minn Med,1976
3. Embryology, anatomy, and diseases of the umbilicus, together with diseases of the urachus;Cullen,1916
4. Metastasis in cancer;Mayo;Proc Staff Meet Mayo Clin,1928
5. Tumors of the umbilicus;Steck;Cancer,1965