Authors: Fernando C Barros; Cesar G Victora; Aluisio J D Barros; Ina S Santos; Elaine Albernaz; Alicia Matijasevich; Marlos R Domingues; Iândora K T Sclowitz; Pedro C Hallal; Mariângela F Silveira; J Patrick Vaughan Journal: Lancet Date: 2005 Mar 5-11 Impact factor: 79.321