[1] Univ Witwatersrand, Fac Hlth Sci, Sch Publ Hlth, SA MRC Wits Ctr Hlth Econ & Decis Sci PRICELESS S, Johannesburg, South Africa
[2] Univ KwaZulu Natal, Hlth Econ & HIV & AIDS Res Div HEARD, Durban, South Africa
[3] Ctr Global Dev, Global Hlth Policy, Washington, DC USA
[4] Imperial Coll London, Sch Publ Hlth, London, England
[5] Minist Hlth Community Dev Gender Elderly & Childr, Pharmaceut Serv Unit, Dar Es Salaam, Tanzania
[6] Univ KwaZulu Natal, Coll Hlth Sci, Durban, South Africa
[7] Univ Witwatersrand, Hlth Econ & Epidemiol Res Off, Johannesburg, South Africa