Funding for this research was provided by:
National Institute of Allergy and Infectious Diseases (R01AI095789)
Instituto de Salud Carlos III (PI14/01422, PI11/00423)
Agència de Gestió d'Ajuts Universitaris i de Recerca (2014 SGR991)
Health Department Catalan Government (SLT006/17/00109)
Received: 20 February 2019
Accepted: 27 June 2019
First Online: 14 August 2019
Ethics approval and consent to participate
: The study protocol was approved by the Ethics Committees from Spain, Mozambique, and Ghana, and written informed consent was obtained from parents or guardians before starting study procedures.
: Not applicable.
: The authors declare that they have no competing interests.