1. Department of Medicine, Faculdade de Medicina de São José do Rio Preto São José do Rio Preto São Paulo Brazil
2. Duke University School of Medicine Durham North Carolina USA
3. Durham Veterans Administration Medical Center Durham North Carolina USA
4. Department of Biostatistics and Bioinformatics Duke University School of Medicine Durham North Carolina USA
5. Division of Hematology, Department of Medicine Duke University School of Medicine Durham North Carolina USA