Araújo de França, G V
Lucia Rolfe, E De
Horta, B L
Gigante, D P
Yudkin, J S
Ong, K K
Victora, C G
Article History
Received: 10 November 2014
Revised: 10 August 2015
Accepted: 7 September 2015
First Online: 23 September 2015
Competing interests
: The authors declare no conflict of interest.