[1] Univ Free State, Fac Hlth Sci, Dept Internal Med, Div Pulmonol & Crit Care, Bloemfontein, South Africa
[2] Univ Pretoria, Fac Hlth Sci, Dept Crit Care, Pretoria, South Africa
[3] Univ KwaZulu Natal, Coll Hlth Sci, Sch Clin Med, Discipline Anaesthesiol & Crit Care, Durban, South Africa
[4] Univ Estadual Londrina, Hosp Univ, Dept Clin Med, Londrina, Brazil
[5] Univ Cape Town, Div Crit Care, Dept Anaesthesia & Perioperat Med, Fac Hlth Sci, Cape Town, South Africa
[6] Chinese Univ Hong Kong, Dept Anaesthesia & Intens Care, Hong Kong, Peoples R China
[7] Univ Toronto, Dept Crit Care Med, Toronto, ON, Canada
[8] Univ Queensland, Royal Brisbane & Womens Hosp, Jamieson Trauma Inst, Brisbane, Australia
[9] Univ Montpellier, Nimes Univ Hosp, Nimes, France
[10] Med Univ Lublin, Fac Med, Dept Anaesthesiol & Intens Therapy 1, Lublin, Poland
[11] Walter Sisulu Univ, Fac Hlth Sci, Dept Anaesthesia, Mthatha, South Africa
[12] Univ Witwatersrand, Fac Hlth Sci, Dept Crit Care, Johannesburg, South Africa
[13] Univ Free State, Dept Surg, Div Crit Care, Bloemfontein, South Africa
[14] Livingstone Hosp, Dept Crit Care, Gqeberha, South Africa
[15] Univ Libre Bruxelles, Erasme Univ Hosp, Dept Intens Care, Brussels, Belgium
[16] Univ Free State, Fac Hlth Sci, Div Hlth Sci Educ, Bloemfontein, South Africa