Risk factors for human immunodeficiency virus infection among bllod donors in São Paulo, Brazil, and their relevance to current donor deferral criteria - Almeida Neto, Cesar de; McFarland, William L.; Murphy, Edward L.; Chen, Sanny; Nogueira, Fatima Aparecida Hangai; Mendrone Junior, Alfredo; Chamone, Dalton de Alencar Fischer; Sabino, Ester Cerdeira (Transfusion, 2007)