[1] Cambridge Univ Hosp NHS Fdn Trust, Acute Med, Cambridge, England
[2] Univ Cambridge, Sch Clin Med, Cambridge, Cambs, England
[3] Kamuzu Univ Hlth Sci, Med & Surg, Blantyre, Malawi
[4] Mid & South Essex NHS Fdn Trust, Acute Med, Southend On Sea, England
[5] Barts Heart Ctr, Cardiol, London, England
[6] Havering & Redbridge Univ Hosp NHS Trust, Cardiol & Gen Med, London, England
[7] Royal Free Hosp, Cardiol, London, England