Funding for this research was provided by:
Päivikki ja Sakari Sohlbergin Säätiö
Helsingin Yliopisto (State research Funding)
Text and Data Mining valid from 2019-09-18
Received: 10 April 2018
Accepted: 10 September 2019
First Online: 18 September 2019
Ethics approval and consent to participate
: This study was conducted with the permission of Helsinki University Hospital and Helsinki University Hospital Ethics Committee (TMK03 §162, 300/13/03/03/2005, final changes accepted 16.6.2016). A separate permission by the Finnish Institute for Health and Welfare, Finland, was granted to use the register data. Consent to participate- not applicable.
: Not applicable.
: The authors declare that they have no competing interests.