%0 Journal Article %K Health Policy %B BMC Health Services Research %D 2021 %G eng %I Springer Science and Business Media LLC %N 1 %R 10.1186/s12913-021-06285-8 %T The complexity of scaling up an mHealth intervention: the case of SMS for Life in Tanzania from a health systems integration perspective %U https://bmchealthservres.biomedcentral.com/track/pdf/10.1186/s12913-021-06285-8.pdf %V 21