Authors: Jean H Humphrey; Edmore Marinda; Kuda Mutasa; Lawrence H Moulton; Peter J Iliff; Robert Ntozini; Henry Chidawanyika; Kusum J Nathoo; Naume Tavengwa; Alison Jenkins; Ellen G Piwoz; Philippe Van de Perre; Brian J Ward Journal: BMJ Date: 2010-12-22