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18. Simultaneous occurrence of umbilical and postanal pilonidal sinus. Hassan MA S Afr Med J; 1969 Jan; 43(4):79-80. PubMed ID: 5776813 [No Abstract] [Full Text] [Related]
19. Comment to "An umbilical surprise: a collective review on umbilical pilonidal sinus". J. B. Ponten, J. E. H. Ponten, M. D. P. Luyer, S. W. Nienhuijs. Kaplan M; Kaplan FÇ Hernia; 2017 Jun; 21(3):493-494. PubMed ID: 28035519 [No Abstract] [Full Text] [Related]