Santos, L P
Ong, K K
Day, F https://orcid.org/0000-0003-3789-7651
Wells, J C K
Matijasevich, A
Santos, I S
Victora, C G
Barros, A J D
Article History
Received: 7 September 2015
Revised: 11 December 2015
Accepted: 22 December 2015
First Online: 16 February 2016
Competing interests
: The authors declare no conflict of interest.