Rolseth, Veslemøy http://orcid.org/0000-0002-6240-7944
Mosdøl, Annhild
Dahlberg, Pål Skage
Ding, Yunpeng
Bleka, Øyvind
Skjerven-Martinsen, Marianne
Straumann, Gyri Hval
Delaveris, Gerd Jorunn Møller
Vist, Gunn Elisabeth
Article History
Received: 30 April 2018
Revised: 21 August 2018
Accepted: 13 September 2018
First Online: 30 November 2018
Compliance with ethical standards
:
: The scientific guarantor of this publication is the last author, Gunn Elisabeth Vist, Division for Health Services, Norwegian Institute of Public Health, Norway.
: The authors declare that they have no conflict of interest.
: Two of the authors have significant statistical expertise.
: Written informed consent was not required for this study because it is a systematic review of published studies.
: Institutional Review Board approval was not required because it is a systematic review of published studies.
: Some study subjects or cohorts have been previously reported in a technical report published in Norwegian by the Norwegian Institute of Public Health (PubMed: ExternalRef removed).Compared to the technical report in Norwegian, the submitted manuscript has been rewritten and updated with three more included studies.
: • Systematic review