Funding for this research was provided by:
Icelandic Centre for Research (50427021, 50427023, 50427022, 100740001)
Text and Data Mining valid from 2018-07-28
Received: 15 February 2017
Accepted: 22 June 2018
First Online: 28 July 2018
Compliance with ethical standards
: Approval for the study was received from the Icelandic National Bioethics Committee (ref. no. 05-107-S1) and the Icelandic Data Protection Authority (ref. no. S2589). When pregnant women attended the antenatal clinics at the beginning of their pregnancy (weeks 12–16), they received information about the study from the midwives, who also invited them to participate. If the women agreed to participate they signed an informed consent. Parental consent was required for women under the age of 18. If the women were in need of psychiatric treatment, they were referred to appropriate treatment at the Mental Health Services at Landspitali–The National University Hospital of Iceland.
: The authors declare that they have no conflicts of interest.