Received: 29 July 2019
Accepted: 10 August 2020
First Online: 19 August 2020
Ethics approval and consent to participate
: Ethical approval was obtained from the Ethics Committee of the School of Public Health and Nutrition of the Universidad Autónoma de Nuevo Leon (registration number 16-FaSPyN-SO-04. Date of approval: 02/17/17). Signed informed consent was obtained from all eligible mothers.
: Not applicable.
: The authors declare that they have no competing interests.