Toward a grounded theory of why some immunization programmes in sub-Saharan Africa are more successful than others: a descriptive and exploratory assessment in six countries.
Health Policy Plan. 2008 Nov;23(6):379-89. doi: 10.1093/heapol/czn028. Epub 2008 Aug 13.
Health Policy Plan. 2008.
PMID: 18701550