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Authors
Toijonen, Anna
Heinonen, Seppo
Gissler, Mika
Macharey, Georg
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Funding
Funding for this research was provided by:
Helsinki University Hospital Research Grants
Helsinki University Library
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Article History
Received: 29 June 2021
Accepted: 7 March 2022
First Online: 16 March 2022
Declarations
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: All study methods were carried out in accordance with relevant guidelines and regulations of Finnish National Board on Research Integrity TENK. In Finland, an ethics review statement or the need of informed consent are not required for scientific research including solely register data. The need of informed consent was waived by the regional research committee of the medical faculty of Helsinki University. The study received ethical approval by the National Institute for Health and Welfare (reference number THL/652/5.05.00/2017) and from the regional research committee of the medical faculty of Helsinki University (reference number 23/2017).
: Not applicable.
: The authors declare that they have no competing interests.
