1. Division of Hematology, Department of Internal Medicine, Mayo Clinic, Rochester, MN;
2. Centro Ricerca e Innovazione Malattie Mieloproliferative, Azienda Ospedaliera Universitaria Careggi, and Department of Experimental and Clinical Medicine, University of Florence, Florence, Italy; and
3. Division of Hematopathology and
4. Division of Cytogenetics, Department of Laboratory Medicine, Mayo Clinic, Rochester, MN