Orthopedic Surgery Transfusion Hemoglobin European Overview (OSTHEO) study: blood management in elective knee and hip athroplasty in europe. - Rosencher,N.; Kerkkamp,H.EM.; Macheras,G.; Munuera,L.M.; Menichella,G.; Barton,D.M.; Cremers,S.; Abraham,I.L. (Transfusion, 2003)