title: Anal fissures, fistulas, abscesses, and hemorrhoids in a tropical population.
mesh_terms: D000038:Abscess / Q000453:epidemiology*; D000293:Adolescent; D000328:Adult; D000367:Age Factors; D001004:Anus Diseases / Q000453:epidemiology*; D044383:Black People; D002648:Child; D005260:Female; D005401:Fissure in Ano / Q000453:epidemiology*; D006484:Hemorrhoids / Q000453:epidemiology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D009549:Nigeria; D012189:Retrospective Studies; D012424:Rural Population; D012737:Sex Factors; D014329:Tropical Climate; D014505:Urban Population