Funding for this research was provided by:
Ministerio de Economía y Competitividad, Gobierno de España (AGL2013-41980-P, AGL2016-75476-R)
Received: 16 December 2018
Accepted: 24 July 2019
First Online: 9 August 2019
Ethics approval and consent to participate
: The Ethical Committee on Clinical Research of the Hospital 12 de Octubre of Madrid approved all study protocols (reference 09/157). Samples and clinical information were obtained after informed, written consent by the study infants’ legal guardians.
: Not applicable.
: The authors declare that they have no competing interests.