Hinnenberg, Pia
Toijonen, Anna
Gissler, Mika
Heinonen, Seppo
Macharey, Georg http://orcid.org/0000-0002-3337-3896
Article History
Received: 7 November 2018
Accepted: 2 February 2019
First Online: 8 February 2019
Compliance with ethical standards
:
: The authors state explicitly that there are no conflicts of interest in connection with this article. All authors declare independence from any funding agency for this work.
: Authorization to use the data was obtained from the National Institute for Health and Welfare as required by the national data protection legislation law in Finland (reference number THL/1200/5.05.00/2012).