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- Riss S, Weiser FA, Schwameis K, Riss T, Mittlbock M, Steiner G, Stift A. The prevalence of hemorrhoids in adults. Int J Colorectal Dis 2012;27:215-220.
- Staroselsky A, Nava-Ocampo AA, Vohra S, Koren G. Hemorrhoids in pregnancy. Can Fam Physician 2008;54:189-190.