1. Department of Social Medicine; Ribeirão Preto Medical School; University of São Paulo - USP; Ribeirão Preto São Paulo Brazil
2. Blood Systems Research Institute; San Francisco CA USA
3. Department of Epidemiology and Biostatistics; University of California San Francisco- UCSF; San Francisco CA USA
4. Department of Laboratory Medicine; University of California San Francisco - UCSF; San Francisco CA USA