Funding for this research was provided by:
National Institutes of Health (R01AI099525)
Received: 14 February 2020
Accepted: 1 June 2020
First Online: 17 June 2020
Ethics approval and consent to participate
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration, and its later amendments or comparable ethical standards. Ethical approval for this study was granted by the Scientific and Ethics Review Unit (SERU) of KEMRI (SSC No. 2076). Written informed consent was obtained from all parents/guardians of minors included in the study.
: Not applicable.
: The authors declare that they have no competing interests.