9 Feb 2016
Shen AK, Weiss JM, Andrus JK, Pecenka C, Atherly D, Taylor K, et al.

Since the mid-2000s low- and lower-middle-income countries have been focusing on developing and using evidence for immunization policy making, with an increasing emphasis on cost-effectiveness analysis, program costing, and financial flows—particularly for the introduction of newer, more expensive vaccines.