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From the Department of Medicine, Imperial College London, Hammersmith Campus, United Kingdom (C.J.R., P.G., J.W., K.C.R.-A., G.W., M.R.W.); Department of Medicine, University of Cambridge School of Clinical Medicine, United Kingdom (C.H., M.B., M.H., M.R.T., S.G., N.W.M.); Cardiology Department, Royal Free Hospital, London, United Kingdom (G.C.); Institute of Cellular Medicine, Newcastle University and the Newcastle Upon Tyne Hospitals NHS Foundation Trust, United Kingdom (P.A.C.); National Pulmonary Hypertension Service, Imperial College Healthcare NHS Trust, Hammersmith Hospital, London, United Kingdom (L.S.H., J.S.R.G.); National Heart and Lung Institute, Imperial College London, Hammersmith Campus, United Kingdom (L.S.H., J.S.R.G.); Sheffield Pulmonary Vascular Disease Unit, Royal Hallamshire Hospital, United Kingdom (D.G.K.); Department of Infection, Immunity & Cardiovascular Disease, University of Sheffield, United Kingdom (D.G.K., A.L.); Scottish Pulmonary Vascular Unit, Golden Jubilee National Hospital, Glasgow, United Kingdom (A.J.P.); Pulmonary Vascular Disease Unit, Papworth Hospital, Cambridge, United Kingdom (J.P.Z., M.R.T.); Pulmonary Hypertension Service, Royal Brompton Hospital, London, United Kingdom (S.J.W.); and Department of Haematology, University of Cambridge, United Kingdom (S.G.).