Funding for this research was provided by:
Eunice Kennedy Shriver National Institute of Child Health and Human Development (P2C HD047879, R00 HD086270)
Received: 7 August 2018
Accepted: 16 August 2019
First Online: 11 September 2019
Ethics approval and consent to participate
: Ethical approval for this study and the informed consent protocol was provided by Princeton University, in Princeton, NJ, (reference number 0000006921) and the Kenya Medical Research Instutitute in Nairobi, Kenya (reference number non-SSC 483). All participants provided written consent to participate in the study.
: Not applicable.
: The authors declare that they have no competing interests.