Funding for this research was provided by:
Stiftelsen Dorothea Olivia, Karl Walter och Jarl Walter Perkléns Minne
Text and Data Mining valid from 2019-03-18
Received: 1 September 2017
Accepted: 7 March 2019
First Online: 18 March 2019
Ethics approval and consent to participate
: The study has been approved by the Ethical committee of the Helsinki University Hospital and follows the principles of the Declaration of Helsinki. As this was a retrospective register study consent from the patients was not needed.
: Not applicable.
: The authors declare that they have no competing interests.
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