Predictors of low haematocrit among repeat donors in São Paulo, Brazil: eleven year longitudinal analysis - Almeida, Fernanda Nascimento; Sabino, Ester Cerdeira; Tunes, Gisela; Schreiber, George B; Silva, Pedro Paulo S. B. da; Carneiro-Proietti, Anna Barbara F; Ferreira, João Eduardo; Mendrone Júnior, Alfredo (Transfusion and Apheresis Science, 2013)