Received: 4 March 2021
Accepted: 16 March 2021
First Online: 3 May 2021
: Data collection for the GSR was centrally approved by the Ethics Committee of the Ludwig-Maximilians University, Munich (689–15) as the leading ethics committee. Further approval was obtained from local ethics committees or institutional review boards according to local regulations.
: In accordance with the institutional review board approval, no informed consent was required because no study-specific procedures were performed and data sampling from patients undergoing MT was already mandated by national law for quality control reasons.
: LS reports lecture fees from Daiichi Sankyo, outside of the submitted work.FF reports consulting fees from Eppdata, outside of the submitted work.GCP reports consulting fees or fees as lecturer from Bayer, Boehringer Ingelheim, Bristol-Myers Squibb and Pfizer, all outside of the submitted work.GT reports consulting fees or fees as lecturer from Acandis, Bayer, Boehringer Ingelheim, Bristol-Myers Squibb, Pfizer, Portola, Stryker, all outside of the submitted work.ME reports grants from Bayer and fees paid to the Charité from Bayer, Boehringer Ingelheim, BMS/Pfizer, Daiichi Sankyo, Amgen, GSK, Sanofi, Covidien, and Novartis, all outside of the submitted work.CHN reports consulting and lecture fess from Boehringer Ingelheim, W.L. Gore and Associates, Bristol-Myers Squibb, Pfizer, and Abbott, all outside of the submitted work.The others have no disclosures.