The New England Journal of Medicine Absence of AntiHuman Immunodeficiency virus types 1 and 2 Seroconversion after the treatment of Hemophilia A or Von Willebrands Disease with pasteurized Factor VIIII concentrate by Dr Schimff K Dr Brackmann H H Dr Kreuz W Dr Kraus B Dr Haschke F Dr Schramm W Dr Moesseler J Dre Auerwald G Dr Sutor A H Dr Koehler K Dr P Hellstern Dr Mutean W and Dr Scharrer I 1989