Ensuring leadership at the operational level of a health system in protracted crisis context: a cross-sectional qualitative study covering 8 health districts in Eastern Democratic Republic of Congo. - Bigirinama, Rosine N.; Makali, Samuel L.; Mothupi, Mamothena C.; Chiribagula, Christian Z.; St Louis, Patricia; Mwene-Batu, Pacifique L.; Bisimwa, Ghislain B.; Mwembo, Albert T.; Porignon, Denis G. (BMC Health Services Research, 2023)