Erratum to "Knowledge management infrastructure to support quality improvement: A qualitative study of maternity services in four European hospitals" [Health Policy 124 (2020) 205–215]. Issue 5 (May 2020) - Karltun, Anette; Sanne, Johan M.; Aase, Karina; Anderson, Janet E.; Fernandes, Alexandra; Fulop, Naomi J.; Höglund, Par J.; Andersson-Gare, Boel