title: [Abstracts of papers presented at the 20th Annual Meeting of the GermanSociety for Thoracic and Cardiovascular Surgery, Wednesday, February 20, 1991 to Saturday, February 23, 1991, Bonn].
mesh_terms: D000818:Animals; D002318:Cardiovascular Diseases / Q000601:surgery*; D013504:Cardiovascular Surgical Procedures; D006801:Humans; D013903:Thoracic Surgery