Funding for this research was provided by:
Text and Data Mining valid from 2019-09-09
Received: 16 June 2019
Accepted: 20 August 2019
First Online: 9 September 2019
Ethics approval and consent to participate
: The study was approved by the Regional Committee for Medical and Health Research Ethics in Central Norway (reference number 2016/841). All mothers were mailed written information about the project and were given the opportunity to decline being included in the study.
: Not applicable.
: The authors declare that they have no competing interest.