Small bowel arteriovenous malformation as a cause of dark gastrointestinal bleeding: Two instructional cases by Eugenio Américo Palomino Portilla, María del Pilar Quiñones Ávila, Isaira Giovanna Torpoco Baquerizo, María Angélica Medrano Huallanca, Katia Sofía Palomino Aguilar

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