Journal Article
                        
                        Brals, Daniella, Sunday A Aderibigbe, Ferdinand W Wit, Johannes CM  Ophem, Marijn  List, Gordon K Osagbemi, Marleen E Hendriks, Tanimola M Akande, Michael  Boele van Hensbroek, and Constance  Schultsz.  
"The effect of health insurance and health facility-upgrades on hospital deliveries in rural Nigeria: a controlled interrupted time-series study." Health Policy and Planning 32, no. 7 (2017): 990-1001.