Figure 2.
Flow of case selection for inclusion in the analysis, Denmark, France, the Netherlands and Spain
TESSy: The European Surveillance System.
a Denmark before 1967, France before 1966, the Netherlands before 1971, Spain before 1970.
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.