Pirhonen, J.
Haadem, K.
Gissler, M.
Article History
Received: 9 January 2020
Accepted: 11 April 2020
First Online: 23 April 2020
Compliance with ethical standards
:
: The authors have no potential conflicts of interest to report.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
: Informed consent was not necessary, registry study. The study was approved by the Ethics Committee of the University of Lund (D.nr 2014/747).