Received: 18 October 2018
Accepted: 10 October 2019
First Online: 13 November 2019
Ethics approval and consent to participate
: The eighth sero-survey had ethical approval from National Research Ethics Committee of Tanzania (Reference MR/53/ 100/22) & London School of Hygiene and Tropical Medicine (Approval 8623).All women participating in the sero-survey were asked for written informed consent.
: All authors provide consent for the publication of this paper.
: The authors declare that they have no competing interests.