Funding for this research was provided by:
Oulun Yliopisto
Article History
Received: 31 October 2018
Accepted: 6 March 2019
First Online: 23 March 2019
Compliance with ethical standards
: The study protocol has been approved by the University of Oulu and Northern Ostrobothnia Hospital ethics committee.
: The authors declare that they have no conflict of interest.