1. Research Group on Economic Models and Quantitative Methods, Centro de Investigaciones para el Desarrollo, Universidad Nacional de Colombia, Colombia
2. General Directorate, Departamento Administrativo Nacional de Estadística
3. Escola Nacional de Ciências Estatísticas
4. Department of Mathematics, Universidad Nacional de Colombia
5. Department of Accounting Sciences, Pontificia Universidad Javeriana
6. Department of Mathematics, University of Connecticut
7. Harvard T.H. Chan School of Public Health, Harvard University
8. Department of Economics, Massachusetts Institute of Technology