Acknowledgments
The authors are indebted to Angela Pries and Christina Beutel who performed SLAMF7 analysis by flow cytometer of the Department of Hematology, AK St. Georg, Hamburg, Germany.
Author contributions
AE and OW have written the paper. HS, CJ, AS, FD, MP and OW have contributed data of patients. MV and CN has performed the IHC with SLAMF7.
Potential conflict of interest
Disclosure forms provided by the authors are available with the full text of this article online at https://doi.org/10.1080/10428194.2019.1623887.