Rönö, Kristiina http://orcid.org/0000-0002-6344-1159
Masalin, Senja http://orcid.org/0000-0003-3078-0303
Kautiainen, Hannu http://orcid.org/0000-0003-0786-0858
Gissler, Mika http://orcid.org/0000-0001-8254-7525
Eriksson, Johan Gunnar http://orcid.org/0000-0002-2516-2060
Laine, Merja Kristiina http://orcid.org/0000-0002-1848-1514
Funding for this research was provided by:
Research Foundation for Primary Health Care, Finland
Helsingin ja Uudenmaan Sairaanhoitopiiri
Article History
Received: 5 December 2019
Accepted: 10 March 2020
First Online: 2 April 2020
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: The ethics committee of the Hospital District of Helsinki and Uusimaa (356/13/03/03/2015, the 2nd November 2015), and the health authority of Vantaa city have approved the study. Finnish Social Insurance Institution, Finnish Institute for Health and Welfare, Social Insurance Institution of Finland, Statistics Finland, and Finnish Tax Administration permitted to use the register data in this study.
: This is a register-based study with no patient contacts. For this type of study, formal consent is not required.