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Handling editor Josef S Smolen
Contributors All authors were involved in writing the article and in the decision to submit it for publication.
Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors.
Competing interests NB: Research grants from Vifor, GSK, Pfizer, Novartis. Advisory board: Lilly, MSD. Speaking fees: Roche, Vifor, AbbVie. SS: GRAPPA global steering committee, ASAS member; research grants, speaker or consultancy fees from AbbVie, BMS, Boehringer-Ingelheim, Celgene, GSK, Janssen, Novartis, Pfizer and UCB.
Patient and public involvement Patients and/or the public were not involved in the design, or conduct, or reporting, or dissemination plans of this research.
Patient consent for publication Not required.
Provenance and peer review Not commissioned; externally peer reviewed.
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