1 The University of Sheffield, Department of Infection, Immunity and Cardiovascular Disease, Sheffield, United Kingdom of Great Britain and Northern Ireland.
2 Sheffield Teaching Hospitals NHS Foundation Trust, Sheffield Pulmonary Vascular Disease Unit, Royal Hallamshire Hospital, Sheffield, United Kingdom of Great Britain and Northern Ireland.
3 The University of Sheffield, INSIGNEO, Institute for In Silico Medicine, Sheffield, United Kingdom of Great Britain and Northern Ireland.
4 Papworth Hospital NHS Foundation Trust, Research and Development, Cambridge, Cambridgeshire, United Kingdom of Great Britain and Northern Ireland.
5 MRC Biostatistics Unit, Cambridge, Cambridgeshire, United Kingdom of Great Britain and Northern Ireland.
6 Cambridge Institute of Public Health, MRC Biostatistics Unit, Cambridge, United Kingdom of Great Britain and Northern Ireland.
7 Imperial College London, London, United Kingdom of Great Britain and Northern Ireland; m.wilkins@imperial.ac.uk.