Funding for this research was provided by:
Российский Фонд Фундаментальных Исследований (17-29-02203)
Institute of Ethnology and Anthropology RAS
Koltzov Institute of Developmental Biology RAS
Koltzov Institute of Developmental Biology RAS basic research program (0108-2019-0007)
Received: 10 June 2020
Accepted: 3 August 2020
First Online: 14 August 2020
Ethics approval and consent to participate
: The study was approved by the Institute of Ethnology and Anthropology, RAS, and Commission for Science and Technology of Tanzania (COSTECH).All the Russian participants gave written informed consent, while in Tanzania, as most of the participants there were illiterate, oral informed consent was provided, following the Declaration of Helsinki.
: Not applicable
: The authors declare that they have no competing interests.