Social Security and Retirement Around the World: Historical Trends in Mortality and Health, Employment, and Disability Insurance Participation and Reforms: Disability in Belgium: There is More than Meets the Eye. Alain Jousten, University of Liege – Department of Economics; Institute for the Study of Labor (IZA); Netspar; International Monetary Fund (IMF; Mathieu Lefèbvre, University of Liege; Sergio Perelman, University of Liege – Department of Economics. September 5, 2011.