About the Authors

Susannah Tomkins

Roles Conceptualization, Formal analysis, Investigation, Methodology, Project administration, Supervision, Writing – original draft, Writing – review & editing

Affiliation NEMEA Centre of Excellence for Retrospective Studies, IQVIA, London, United Kingdom

Callum Chapman

Roles Conceptualization, Methodology, Validation, Writing – review & editing

Affiliation Chelsea and Westminster Hospital, London, United Kingdom

Melissa Myland

Roles Investigation, Methodology, Project administration, Supervision, Visualization, Writing – original draft, Writing – review & editing

Affiliation NEMEA Centre of Excellence for Retrospective Studies, IQVIA, London, United Kingdom

Rachel Tham

Roles Conceptualization, Data curation, Formal analysis, Investigation, Software, Writing – review & editing

Affiliation NEMEA Centre of Excellence for Retrospective Studies, IQVIA, London, United Kingdom

Rachael de Nobrega

Roles Conceptualization, Funding acquisition, Validation, Writing – review & editing

Affiliation Vifor Pharma UK Ltd, Surrey, United Kingdom

Brinley Jackson

Roles Conceptualization, Funding acquisition, Writing – review & editing

Affiliation Vifor Pharma UK Ltd, Surrey, United Kingdom

Satish Keshav

Roles Conceptualization, Investigation, Methodology, Validation, Writing – review & editing

satish.keshav@ndm.ox.ac.uk

Affiliation Gastroenterology Unit, John Radcliffe Hospital, Oxford, United Kingdom

Competing Interests

Authors RdN and BJ are employees of Vifor Pharma UK Ltd. Authors ST, MM, and RT are employees of QuintilesIMS who received consulting fees for conducting the study. Author SK declares the following competing interests: consulting fees in the previous five years from pharmaceutical and healthcare companies including Abbvie, Allergan, Astra-Zeneca, Boehringer Ingelheim, ChemoCentryx Inc, Dr Falk Pharma, Gilead, GSK, Merck, Mitsubishi Tanabe Pharma, Pharmacosmos, Pfizer, Takeda, and Vifor Pharma, and research support from Abbvie, ChemoCentryx Inc, GSK, and Merck. CC has been employed by hospital trusts which received educational funding support by Vifor Pharma UK Ltd. The competing interests declared do not alter our adherence to PLOS ONE policies on sharing data and materials.