[1] Groote Schuur Hosp, Dept Med, J49 Old Main Bldg, ZA-7925 Cape Town, South Africa
[2] Univ Cape Town, J49 Old Main Bldg, ZA-7925 Cape Town, South Africa
[3] Univ Liverpool, Inst Infect & Global Hlth, Brain Infect Grp, Liverpool, Merseyside, England
[4] Walton Ctr Neurol & Neurosurg, Dept Neurol, Liverpool, Merseyside, England
[5] Yaounde Cent Hosp, Cardiol Unit, Yaounde, Cameroon
[6] Univ Yaounde I, Fac Med & Biomed Sci, Dept Internal Med & Specialties, Yaounde, Cameroon