Houlihan Catherine F, Bland Ruth M, Mutevedzi Portia C, Lessells Richard J, Ndirangu James, Thulare Hilary, Newell Marie-Louise
Wellcome Trust Africa Centre for Health and Population Studies, University of KwaZulu-Natal, Somkhele, South Africa.
Int J Epidemiol. 2011 Apr;40(2):318-26. doi: 10.1093/ije/dyp402. Epub 2010 Feb 12.