Figure 2.
Management and legal obligation of national registries. In light blue are indicated the countries with mandatory national registries (n = 16), out of which 14 are managed by a National Competent Authority (NCA) and 2 by a combination of an NCA and a national association. In dark blue appears the number of voluntary national registries (n = 5), of which four are run by a national association and one is by a NCA.