Funding for this research was provided by:
Received: 7 April 2020
Accepted: 22 September 2020
First Online: 29 October 2020
Ethics approval and consent to participate
: The German BiKeR Registry was approved by the responsible independent ethics committee of the Aerztekammer Nordrhein, Duesseldorf. Written informed consent was obtained from patients and parents/legal guardians and repeated if patient became adult. Only pseudonymized data were collected.
: Not applicable.
: AK has received congress travel fees from Sobi and Sandoz as well as advisory board honoraria from Celgene. FD has received honoraria for lectures from Pfizer, Abbvie, and Novartis. AH has received advisory board honoraria from Novartis, Chugai-Roche, and Sobi. KM has received honoraria from Abbvie, GSK, Biermann, Medac, and Sanofi. IF discloses advisory board participation for Novartis, Genzyme, Bayer, Lilly, Pfizer, Abbvie, and Sanofi. JKD has received consultant/speaker fees from Novartis and Sobi, as well as pharmaceuticals and grant support from Sobi and Novartis. FWH has received speaker honoraria from Pfizer, Abbvie, Novartis, Sobi, and Roche. GH has received research funds, advisory board membership, and honorary fees from Abbvie, Pfizer, Novartis, and Roche/Chugai. The other authors have declared no competing interests.