This article provides a great background on supply chains in the global health last mile setting:
Prashant Yadav(2015)Health Product Supply Chains in Developing Countries: Diagnosis of the Root Causes of Underperformance and an Agenda for Reform,Health Systems & Reform,1:2,142-154,DOI: 10.4161/23288604.2014.968005 (click PDF for free access)
Supply Chain Agenda for Reform - (Great background to supply chains in the last mile setting)