[1] Univ Cape Town, Fac Hlth Sci, Dept Family Community & Emergency Care, Primary Hlth Care Directorate, Rondebosch, South Africa
[2] Univ Witwatersrand, Div Rural Hlth, Dept Family Med & Primary Care, Fac Hlth Sci, Johannesburg, South Africa
[3] Univ Western Cape, Fac Community & Hlth Sci, Interprofess Educ Unit, Cape Town, South Africa
[4] Univ Cape Town, Fac Hlth Sci, Div Anat Pathol, Rondebosch, South Africa
[5] Univ Cape Town, Fac Hlth Sci, Sch Publ Hlth, Rondebosch, South Africa
[6] Univ Cape Town, Fac Hlth Sci, Dept Pathol, Rondebosch, South Africa
[7] Stellenbosch Univ, Div Family Med & Primary Care, Fac Med & Hlth Sci, Cape Town, South Africa
[8] Univ KwaZulu Natal, Coll Hlth Sci, Discipline Occupat & Environm Hlth, Durban, South Africa
[9] Univ Cape Town, Fac Hlth Sci, Sch Publ Hlth, Div Environm Hlth, Rondebosch, South Africa