Funding for this research was provided by:
Stockholms Läns Landsting (20140095)
Received: 1 December 2019
Accepted: 28 January 2020
First Online: 8 February 2020
Ethics approval and consent to participate
: The study was performed according to the Helsinki declaration and approved by the Swedish Ethical Review Authority (reference number 2019–01154) on March 18th 2019. Informed consent was waived because of the retrospective design of this study, which did not involve any additional risk for patients.
: Not applicable.
: The authors declare that they have no competing interests.