Authors: Webster Mavhu; Jessica Berwick; Petronella Chirawu; Memory Makamba; Andrew Copas; Jeffrey Dirawo; Nicola Willis; Ricardo Araya; Melanie A Abas; Elizabeth L Corbett; Stanley Mungofa; Susan M Laver; Frances M Cowan Journal: PLoS One Date: 2013-07-23 Impact factor: 3.240