Funding for this research was provided by:
Helsingin Yliopisto
Article History
Received: 7 May 2020
Accepted: 28 July 2020
First Online: 7 August 2020
Compliance with ethical standards
:
: The author A. Toijonen declares that she has no conflict of interest. The author S. Heinonen declares that he has no conflict of interest. The author M. Gissler declares that he has no conflict of interest. The author G. Macharey declares that he has no conflict of interest.
: This article does not contain any studies with human participants performed by any of the authors.
: The register keeping organizations gave their permission to use their confidential health data in this study. No registered persons were contacted and thus, no consent for participant was needed. The Finnish Institute for Health and Welfare authorized to use the data (reference number THL/652/5.05.00/2017).
: SAS custom code cannot be shared publicly, but it is available on request from Mika Gissler (mika.gissler@thl.fi).