1. Rutherford ME, Mulholland K, Hill P: How access to health care relates to under-five mortality in sub-Saharan Africa: systematic review. Trop Med Int Health. 2010, 15 (5): 508-19.
2. Bedford J, Singh A, Ponferrada MB, Eldred L: Access to health services: analysing non-financial barriers in Ghana, Bangladesh, Vietnam and Rwanda using qualitative methods: a review of the literature. 2013, New York: UNICEF, Knowledge Management and Implementation Research Unit, Health Section, Program Division
3. Pluye P, Potvin L, Denis JL: Making public health programs last: conceptualizing sustainability. Eval Program Plann. 2004, 27 (2): 121-33.
4. Howlett MP: Designing public policies: principles and instruments. 2011, New York: Routledge
5. Simmons R, Fajans P, Ghiron L: Scaling up health service delivery: from pilot innovations to policies and programmes. 2007, Geneva: World Health Organization