1. MSBase. www.msbase.org.
2. Danish MS Registry. www.researchgate.net/publication/51507915_The_Danish_Multiple_Sclerosis_Registry.
3. Swedish MS Registry. http://www.neuroreg.se/sv.html/multipel-skleros.
4. Observatoire Français de la Sclérose en Plaques (OFSEP). www.ofsep.org/fr.
5. European Database for Multiple Sclerosis (EDMUS). www.edmus.org.