. Author manuscript; available in PMC: 2015 Nov 1.
Published in final edited form as: Acta Obstet Gynecol Scand. 2014 Jun 9;93(11):1123–1130. doi: 10.1111/aogs.12425
© 2014 Nordic Federation of Societies of Obstetrics and Gynecology, Acta Obstetricia et Gynecologica Scandinavica