Footnotes

• 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.