1. 1Department of Internal Medicine, Mayo Clinic School of Graduate Medical Education, Rochester, MN
2. 2Division of Hematopathology, Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN
3. 3Division of Hematology, Department of Medicine, Mayo Clinic, Rochester, MN
4. 4Division of Hematology, Department of Medicine, Mayo Clinic, Jacksonville, FL
5. 5Division of Hematology, Department of Medicine, Mayo Clinic, Phoenix, AZ
6. 6Department of Medicine, Case Western Reserve University School of Medicine, Cleveland, OH