Vilkko, Riitta
Räisänen, Sari
Gissler, Mika
Stefanovic, Vedran
Kalliala, Ilkka
Heinonen, Seppo
Article History
Received: 23 November 2021
Accepted: 31 May 2022
First Online: 13 June 2022
Declarations
:
: Ethics approval or patient consent was not needed because of the nature of this registered study. The data are collected from Finnish MBR and are owned and anonymised by the Finnish Institute of Health and Welfare (THL). The authorisation to use the anonymised MBR data was given by the registered keeper, the Finnish Institute of Health and Welfare (references: THL/1749/5.05.00/2011, THL/998/5.05.00/2013, and THL/876/5.05.00/2017). Patients were not involved in this study. All methods were carried out in accordance with relevant guidelines and regulations.
: Not applicable.
: The authors declare that they have no competing interests.