Espinosa Acuña, Óscar A. and Pinzón Fonseca, D.A. 2018. Seasonality of expense in health in Colombia, 2011-2015. Semestre Económico. 20, 44 (Feb. 2018), 137–158. DOI:https://doi.org/10.22395/seec.v20n44a7.