Funding for this research was provided by:
Wellcome Trust (088862/Z/09/Z)
Received: 2 November 2020
Accepted: 29 December 2020
First Online: 5 February 2021
Ethics approval and consent to participate
: The study protocol was approved by the Ethics Committees of the Pedro Vicente Maldonado Hospital and Universidad San Francisco de Quito, Quito, Ecuador. The study was registered as an observational study (ISRCTN 41239086). Informed written consent was obtained from the mothers for their participation and that of their children.
: Not applicable.
: The authors declare that they have no competing interests.