Received: 25 December 2019
Accepted: 19 March 2020
First Online: 26 March 2020
Compliance with ethical standards
: The authors declare that there is no potential or actual personal or financial interest in the material, information, or techniques described in this article.
: The study was conducted in accordance with the principles of the Ethics Committee of Helsinki Hospital District, Helsinki, Finland, and the research protocol was approved by Helsinki University Hospital Ethics Committee (nr. HUS/330/13/02/2012).