Correction to: A phase I–II study of plerixafor in combination with fludarabine, idarubicin, cytarabine, and G-CSF (PLERIFLAG regimen) for the treatment of patients with the first early-relapsed or refractory acute myeloid leukemia (Annals of Hematology, (2018), 10.1007/s00277-018-3229-5)