{{Cite journal| doi = 10.1016/j.socscimed.2017.02.027| issn = 02779536| volume = 179| pages = 27–35| last1 = Zombré| first1 = David| last2 = De Allegri| first2 = Manuela| last3 = Ridde| first3 = Valéry| title = Immediate and sustained effects of user fee exemption on healthcare utilization among children under five in Burkina Faso: A controlled interrupted time-series analysis| journal = Social Science & Medicine| access-date = 2018-09-20| date = 2017-04| url = https://linkinghub.elsevier.com/retrieve/pii/S0277953617301235}}