1. Hematology Service, University Hospital, Universidade Federal Fluminense, Niteroi, Brazil
2. Department of Preventive Medicine, University Hospital, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
3. Division of Hematology/Oncology, University of Cincinnati, Cincinnati, Ohio
4. Department of Internal Medicine, University Hospital, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil