Funding for this research was provided by:
Directorate-General for International Cooperation and Development
Government of France (None)
Government of Switzerland (None)
Article History
Received: 22 August 2019
Accepted: 4 February 2020
First Online: 17 February 2020
Ethics approval and consent to participate
: Not applicable.
: Not applicable.
: The authors declare that they have no competing interests.