1. Faculty of Health Sciences, Marien Ngouabi University of Brazzaville, n°1 Avenue des 1er Jeux Africains, Brazzaville, Republic of the Congo
2. University Teaching Hospital of Brazzaville, n°13 bd Auxence Ikonga, BP 32, Brazzaville, Republic of the Congo
3. Reference Hospital of Talangai, n°35 Avenue des 3 martyrs, Talangaï District, Brazzaville, Republic of the Congo
4. General Hospital of Loandjili, Route n°1, BP 8122, Pointe-Noire, Republic of the Congo
5. Head of Social and Health District from Pointe-Noire, Pointe-Noire, Republic of the Congo
6. Imperial Clinical Trials Unit, Imperial College London, Stadium House, 68 Wood Lane, London W12 7RH, UK
7. Department of Primary Care and Public Health, Imperial College London, St Dunstan’s Road, London W6 8RP, UK