Ridde, Valéry http://orcid.org/0000-0001-9299-8266
Yaméogo, Pierre
Article History
Received: 9 April 2018
Accepted: 12 September 2018
First Online: 2 October 2018
Competing interests
: The two authors have served as consultants to non-governmental organisations on the issue of user-fees abolition. The funders and NGOs had no role in this study or the decision to submit the article for publication.