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This web page gs2011.blogspot.com states the following, "University of Alberta Rural North General Surgery Study Material." We saw that the webpage said " Tuesday, December 11, 2012." It also said " 2 describe preventative, medical and surgical treatment. 1 differentiate perianal, ischiorectal, intersphincteric, supralevator and horseshoe abscesses;. 2 describe drainage technique of uncomplicated perianal and ischiorectal abscesses. 1 differentiate internal, external hemorroids, rectal prolapse. 2 describe treatment of external hemorroids. Saturday, November 24, 2012."