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American Cancer Society: “Frequently Asked Questions About Colonoscopy and Sigmoidoscopy.”
American Gastroenterological Association: "Living with Hemorrhoids."
American Society of Colon & Rectal Surgeons: “Hemorrhoids.”
Harvard Health Publications, Harvard Medical School: "Hemorrhoids and what to do about them."
FamilyDoctor.org: “Hemorrhoids: Causes and Risk Factors."
UpToDate: "Patient information: Hemorrhoids (Beyond the Basics)."
Reviewed by William Blahd, MD on August 26, 2016
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