Acknowledgements
This registry is granted by Celgene and Novartis. We thank all participating hematologists for the contribution of data and B. Haastert (mediStatistica, Neuenrade, Germany) for part of the statistical analysis.
Potential conflict of interest
Disclosure forms provided by the authors are available with the full text of this article online at https://doi.org/10.1080/10428194.2017.1375105.