aLeukemia Service, Department of Medicine, Memorial Sloan Kettering Cancer Center, New York, New York

bSection of Hematology, Department of Internal Medicine, Yale University School of Medicine, Yale University, New Haven, Connecticut, USA

Correspondence to Lohith Gowda, MD, MRCP, Assistant Professor, Section of Haematology, Yale School of Medicine, Yale University, New Haven, CT 06510, USA. E-mail: [email protected]