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Diagram of common sites of major anal and internal hemorrhoids. A: Diagram of common sites of major anal cushions; B: Common sites of internal hemorrhoids. | Lohsiriwat, V. (2012). Hemorrhoids: from basic pathophysiology to clinical management. World Journal of Gastroenterology, 18(17), 2009–2017. https://doi.org/10.3748/wjg.v18.i17.2009

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