1. Division of Hematology, University of Washington, Seattle, WA;
2. Department of Internal Medicine, American University of Beirut, Beirut, Lebanon;
3. Department of Clinical Epidemiology and Biostatistics, McMaster University, Hamilton, ON, Canada;
4. Department of Medicine, University at Buffalo, Buffalo, NY;
5. University of New Mexico, Albuquerque, NM; and
6. Department of Medicine, McMaster University, Hamilton, ON, Canada