1. Department of Medicine, Division of Hematology, Mayo Clinic, Rochester, MN, USA;
2. Department of Laboratory Medicine and Pathology, Division of Hematopathology, Mayo Clinic, Rochester, MN, USA;
3. Department of Internal Medicine, Mayo Clinic, Rochester, MN, USA;
4. Department of Biomedical Statistics and Informatics, Mayo Clinic, Rochester, MN, USA