Adler, Katti
Rahkonen, Leena
Kruit, Heidi
Article History
Received: 26 May 2020
Accepted: 9 July 2020
First Online: 21 July 2020
Ethics approval and consent to participate
: The study protocol was approved by the institutional review board (IRB) of the hospital region (Helsinki and Uusimaa Hospital District Committee for Obstetrics and Gynecology) (nr. HUS/3172/2018 and HUS/54/2019). Due to the retrospective nature of the study, written informed consent was waived by the IRB according to national legislation (Medical Research Act 488/1999, Chap. 2 a (23.4.2004/295), Sect. 5 and 10a).
: Not applicable
: The authors declare that they have no competing interests.