Funding for this research was provided by:
European Research Council (ERC 671055)
Text and Data Mining valid from 2018-12-01
Received: 6 July 2018
Accepted: 24 October 2018
First Online: 4 December 2018
Ethics approval and consent to participate
: This study was approved by both the ethical committee of the University of Antwerp and of the School of Public Health of the University of Kinshasa, DRC. All participants were asked and have given written (with finger printing as signature for persons who could not write) informed consent before the interviews.
: Not applicable.
: The authors declare that they have no competing interests.