title: Pharmacological sphincterotomy for chronic anal fissures by botulinum toxin a.
authors.affiliation: Department of Dermatology and Allergology, Hospital Dresden-Friedrichstadt, Academic Teaching Hospital of the University of Dresden, Friedrichstrasse 41, Dresden, Germany.
authors.forename: Uwe
authors.initials: U
authors.lastname: Wollina
keywords: Anal fissure; botulinum toxin; lateral sphincterotomy; therapeutic algorithm