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Article History

Received: 24 May 2020

Accepted: 26 October 2020

First Online: 7 November 2020

Compliance with ethical standards

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: A.K. has received travel support from Celgene.K.N. has received honoraria from Jazz Pharmaceuticals and travel support from Celgene.M.K. has no conflicts of interest to declare.T.S. received honoraria and research funding from Celgene.G.K. received honoraria, travel support, and research funding from Amgen and Celgene, and honoraria and travel support from Neovii, Abbvie, Roche, Biotest, Pfizer, Jazz Pharmaceuticals, Takeda, Medac, MSD, and Novartis.A.K. received honoraria from Otsuka, Takeda, and Novartis and travel support from Takeda.J.K. received travel support from Jazz Pharmaceuticals.C.R. received travel support from Jazz Pharmaceuticals and travel support and honoraria from Celgene.R.H. has no conflicts of interest to declare.N.G. received honoraria from Novartis and research funding from Alexion and Takeda.N.B. received travel support from Novartis, Roche, Amgen, Celgene, Sanofi Genzyme, and Janssen and research funding from Novartis, Roche, and Celgene.U.G. received honoraria from Celgene, Novartis, Jazz Pharmaceuticals, and Amgen and research funding from Celgene and Novartis.

: This study was performed in line with the principles of the Declaration of Helsinki. Approval was granted by the Ethics Committee of the Heinrich-Heine University Duesseldorf (Feb. 2014/No. 3768, 3973, 3008).The retrospective chart reviews of the study involving human participants were in accordance with the ethical standards of the institutional and national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards. The Human Investigation Committee of the Heinrich-Heine University Duesseldorf approved this study.

: Informed consent was obtained from all individual participants included in the study.

: Patients signed informed consent regarding publishing their data.

: Not applicable