1 Denver Health and Hospital Authority, Hospital Medicine, Denver, CO, USA; University of Colorado Anschutz Medical Campus, Department of Medicine, Aurora, CO. Katherine.stafford@cuanschutz.edu.
2 Beth Israel Deaconess Medical Center, Division of Hematology and Oncology, Boston, MA.
3 The University of North Carolina at Chapel Hill School of Medicine, Blood Research Center and Division of Hematology, Chapel Hill, NC.