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Montes Tapia, Fernando Félix y Garza Luna, Ulises y Cura Esquivel, Idalia Aracely y Gaytan Saracho, Diego y O Cavazos, Manuel Enrique de la (2012) Appendicoumbilical fistula, a cause of an umbilical mass with drainage. Journal of Pediatric Gastroenterologic Nutrition, 55 (5). p. 133. ISSN 1536-4801