Funding for this research was provided by:
Helsingin ja Uudenmaan sairaanhoitopiiri
Article History
Received: 2 May 2019
Accepted: 26 October 2019
First Online: 4 November 2019
Compliance with ethical standards
:
: The authors declare that they have no conflicts of interest.
: Finnish Institute for Health and Welfare (THL) gave permission to use their sensitive health data in this research after receiving a positive statement from the agency of the Data Protection Ombudsman. The study was exempted from informed consent, since only register data were used and no registered person was contacted.