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Funding AK, KD and MAG have received unrestricted educational or research grants from Bayer UK, Pfizer UK, Actelion UK and Actelion Global. Furthermore, they have received support from the Pulmonary Hypertension Association (UK) and the British Heart Foundation.
Competing interests we have provided information regarding disclosures in the submitted manuscript. Please copy from the ‘Disclosures’ in the submitted manuscript.
Provenance and peer review Commissioned; internally peer reviewed.