Funding for this research was provided by:
European Research Council (759933)
Grantová Agentura České Republiky (19-09352S-P505)
Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung (320030_159669)
Text and Data Mining valid from 2019-12-01
Received: 24 June 2019
Accepted: 15 November 2019
First Online: 2 December 2019
Ethics approval and consent to participate
: Verbal informed consent was obtained from all the participants with the help of an interpreter before samples were collected. The sample collection procedure and research was approved by the Ministry of Scientific Research and Innovation (MRSI) and the National Council of Scientific Research and Technology (CNRST) in Burkina Faso (Permit number 0495). The study was approved by the Ethical Committee of the Charles University in Prague (approval no. 2016/07) and by the Swedish Ethical Review Authority (approval no. 2019–00479). Research have been performed in accordance with the Declaration of Helsinki.
: The authors declare that they have no competing interests.