title: Nordic and international efforts.
authors.forename: Reynir Tómas
authors.initials: RT
authors.lastname: Geirsson
authors.forename: Jens
authors.initials: J
authors.lastname: Langhoff-Roos
mesh_terms: D019992:Databases as Topic; D005260:Female; D006801:Humans; D009774:Obstetrics; D011247:Pregnancy; D011248:Pregnancy Complications; D012042:Registries; D012537:Scandinavian and Nordic Countries