1. Faculty of Health Sciences, Marien Ngouabi University, n°1, avenue des 1ers jeux africains, PO Box 2672, Brazzaville, Republic of the Congo
2. Department of Cardiology, University Hospital of Brazzaville, 13 Bd Auxence Ikonga, Brazzaville, Republic of the Congo
3. Department of medicine, Hopital de Base de Talangaï, 35 avenue des trois martyrs, Brazzaville, Republic of the Congo
4. Department of cardiology, General Hospital Adolphe Cisé of Pointe-Noire, n°6 rue Fayette Tchitembo, PO Box 657, Pointe-Noire, Republic of the Congo
5. Imperial Clinical Trials Unit, Stadium House, Imperial College London, 68 Wood Lane, London W12 7RH, UK
6. Department of Primary Care and Public Health, Imperial College London, St Dunstan’s Road, London W6 8RP, UK
7. Department of Mathematics, Huxley Building, South Kensington Campus, Imperial College London, London SW7 2AZ, UK