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Contributors Both authors drafted the manuscript and revised it.
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 PSJ has received consulting fees from Novartis and Vifor Pharma, advisory board and speaker’s fees from Novartis and grant funding from Boheringer Ingelheim.
Patient consent Not required.
Provenance and peer review Commissioned; internally peer reviewed.