Funding for this research was provided by:
Ida Montinin Säätiö
Aarne Koskelon Säätiö
Helsinki University Central Hospital Research Funds
Received: 4 December 2017
Accepted: 1 February 2018
First Online: 8 February 2018
Ethics approval and consent to participate
: All participants gave written informed consent and the study was approved by the ethics committee of the Helsinki University Hospital.
: Not applicable.
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.