Simoila, Laura
Isometsä, Erkki
Gissler, Mika
Suvisaari, Jaana
Halmesmäki, Erja
Lindberg, Nina
Funding for this research was provided by:
University of Helsinki including Helsinki University Central Hospital
Article History
Received: 21 March 2018
Accepted: 30 January 2019
First Online: 14 February 2019
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
: This is a register-based study, and the subjects were not contacted. Thus, informed consent was not obtained.