Received: 15 April 2019
Revised: 4 July 2019
Accepted: 17 July 2019
First Online: 29 August 2019
Compliance with ethical standards
: NK: travel support from Celgene, Amgen and Takeda, MD: speaker’s honoraria from Amgen, Celgene, Janssen, Takeda. Other authors declare that they have no conflict of interest.