Text and Data Mining valid from 2019-08-05
Received: 18 April 2019
Accepted: 26 July 2019
First Online: 5 August 2019
Ethics approval and consent to participate
: The study protocol was approved by the ethics committee of the Kuopio University Hospital (number 129/2009). All the participants signed an informed consent form. This study was carried out in compliance with the Helsinki Declaration.
: Not applicable. The manuscript does not contain any individual person’s data in any form.
: The authors declare that they have no competing interests.