[1] Univ Witwatersrand, Fac Hlth Sci, Dept Mol Med & Haematol, Johannesburg, South Africa
[2] Univ Witwatersrand, Fac Hlth Sci, Dept Med, Div Crit Care, Johannesburg, South Africa
[3] Univ Witwatersrand, Fac Hlth Sci, Dept Med, Div Pulmonol, Johannesburg, South Africa
[4] Tech Univ Munich, Klinikum Rechts Isar, Munich, Germany
[5] Univ Amsterdam, Acad Med Ctr, Amsterdam, Netherlands
[6] Technion, Rambam Hlth Care Campus, Haifa, Israel
[7] Milpk Hosp, Johannesburg, South Africa
[8] Christiaan Barnard Mem Hosp, Dept Obstet, Cape Town, South Africa
[9] Linksfield Clin, Johannesburg, South Africa
[10] Rosebank Clin, Johannesburg, South Africa
[11] Christiaan Barnard Mem Hosp, Vasc Ctr, Cape Town, South Africa
[12] Univ Witwatersrand, Fac Hlth Sci, Dept Orthopaed Surg, Johannesburg, South Africa
[13] Ampath Labs, Pretoria, South Africa