This article looks at what kind of research was conducted on Health System challenges, where it was performed, in which health sectors and on which populations. It also identifies the types of challenge that were most present and how they varied across countries
Roncarolo, F., Boivin, A., Denis, J.-L., Hébert, R., Lehoux, P. (2017). What do we know about the needs and challenges of health systems? A scoping review of the international literature, BMC Health Services Research.