Authors: Aris T Papageorghiou; Eric O Ohuma; Michael G Gravett; Jane Hirst; Mariangela F da Silveira; Ann Lambert; Maria Carvalho; Yasmin A Jaffer; Douglas G Altman; Julia A Noble; Enrico Bertino; Manorama Purwar; Ruyan Pang; Leila Cheikh Ismail; Cesar Victora; Zulfiqar A Bhutta; Stephen H Kennedy; José Villar Journal: BMJ Date: 2016-11-07