Recombinant Hirudin for Cardiopulmonary Bypass Anticoagulation: A Randomized, Prospective, and Heparin-Controlled Pilot Study - Riess, F -C; Poetzsch, B; Madlener, K; Cramer, E; Doll, K -N; Doll, S; Lorke, D E; Kormann, J; Mueller-Berghaus, G (The Thoracic and Cardiovascular Surgeon, 2007)